307 crank in a 305. Awesome motor, I had a 69 302 z28 .
307 crank in a 305. All for street, nothing wrong with them for that.
307 crank in a 305 327 large journal (68-69) and 350 block can interchange. 060 and dropped in a 350 crank, it Another note about 305's is that the cast iron used in the blocks doesn't have as high a nickel content as the earlier 350's, like the 010 blocks, and they wear faster. 350 cracked block nuff said, wanna bet the internals are shot, 307 boat anchor maybe good for bracketing, while I dig a 327 it's more nostalgia than anything, 12. 94 valves work just fine in them. I know 305s had smaller bores and most aftermarket heads won you can make a 350 into a 327, with the crank from a lg journal 327 or a chev 307. 25" stroke) in a 350 block, will give you a 327. 25" stroke crank, without the 4" bore). 7 u should have # on the external crank flange and also block do not assume the blk is the motor cid they mutted them things up mix match ectect pre 86 and above 86 split the yrs many of parts was used on different models and yrs the crank will not tell the truth either will the heads the bore will as i said check that . 84" intake valves to help with both unleaded gas problems and improve performance. Then I would grind the pad clean on the 350 block and restamp it with a 307 Mar 9, 2000 · by the time he has done the mill work he has spent the mony for a set of pistons. SHARE POST #9. I had that combo once and it ran really well. just food for thought ay. I plan to use this all with a TPI intake and 700R4 going into my 63 I've built a few 307 engines. It will also I'd take a 307 over a 305 any day. I believe what you should do is find an olds 350 or 330 block because they swap in place of the 307 and if you do it right it still would look stock but with a lot more horse i think that would be best instead of trying to stroke the 307. We put a 400 crank in a 307 block about 20 years ago in my street stock on pavement. The block used to make the 307 is the late model large journal block, unlike the early 283 blocks which were A 305-307 ci motor could be competitive against a 350 if it was allowed to run a domed piston and higher compression. I believe the 283 and 307 have the same 3. 5 to compression and iron heads is going to run like crap on pump gas unless you retard the timing You could also find a forged steel 302 Z-28 crank and drop it into your 307 block and build a high winding large journal 283 motor. Years ago I did a very low buck 307 rebuild and bolted all the left over parts I had hanging around (heads, intake, carb, cam, headers, etc. 876 x 3. 125 bore) to 4in (same as a 327 or 350) is VERY risky. They sleeve a 307 block down to 305 bore to make a real stiff block. 48"), so cranks will interchange on like years. You could use a stock 265 piston 3. 060 over · Crank = Stock GM Forged Steel (3941188), Lightened, Smoothed, Knive Edged, etc for less windage, balanced with the entire rotating assembly the PROBLEM you face in getting the 305-307 to run is mostly the lack of compareable air flow rates,the result of the smaller valve sizes that will clear the bore and the valve shrouding that the May 8, 2003 · hey i just got done building my 307 and i think its goning to be a good runner heres what i did. The 327 chevy engine is a 350 block with a 307 crank. Nov 19, 2010 · Some factory 307's, some old 283's with a 3. Advanced Search Cancel Login / Join. Even if you don't take advantage of the larger bore with The 305 has a VERY small bore (like the original 55-56 265s), whereas the 307 has the same bore as a 283 (3. However, the 307 should be able to rev higher and produce a higher peak horsepower. 25) so putting a 327 crank in a 350 will do nothing but make it a 327. A 305 has a bore similar to a 265 but with a 350 crank. Why not get some combination that is tried and true. 75 or 9. The 305 and 350 use a 3. In any case, the above advice about heads from a 305 is great Cool as hell that you're keeping that If you drop a 307 crank into ANY 4in bore block-----you have a 327! OR, you could turn down the mains on a 307 crank and drop it into a small journal 327 block and still have a 327. 48/2=1. It 327 rods would be better. 030" bore your cubic inches will be 331. There, you get the i DONT KNOW if a 305 crank is lighter. 48" crank and make it work? Anybody out there do this? As mentioned 305`s won`t bore that much. anyhow. Of course a Here's a performance build-up of the often-overlooked 307 small block Chevy V8. There are 2 ways to do it on low budget. so you need to either move the pin towards the deck or run shorter rods with the longer 3. He claims they put a so ,, the 307 has one hand tied behind its back again ,, u could get a 350 crank offset ground to 3. In a 26ft boat you want as much tq as you can get and unless you want a 383 then stick with the tree fitty. I always wondered why that was, since they Sorry ChevelleSS LS6, you're wrong. However, how they reach 343 cubes is by stroking them with a 400 crank. 703 rod. 327 is same stroke as 307 but 307 bore is smaller. 25" crankshaft, a bore of 4. 48-3. No, a big block crank will not come close to fitting in a small block. 675=8. and all things being equal should have a little more torque. The 3. A 307 305 junk the only thing it is good for is basic propulsion and to make v8 sounds, riteous 140 or so hp. 56 rods. 71 Camairo [This message has been edited by 71 Camairo (edited 03-23-2000). by the way the 305 ho's or 305 swirlies with 1. If you have 327 pistons you could easily build a 327. The 307 crankshaft casting numbers are as follows: 3911001 3911011 3941174 The above numbers are cast cranks found in all 307s and some 327s. 25" crank. 307 as far as i know where reliable but most people never bothered to build them. 25" stroke. Do I use the 350 rods and Pistons or do I need to get longer rods and special I checked with AFR and they said Hot Rod had the heads laying around from a project (I believe a 305) they never got to and that AFR would recommend larger valves in the same heads, which should even give a better engine. 875" bore. 030, so 4. The 327 shared stroke with the 307. Awesome motor, I had a 69 302 z28 The KB hypereutectic pistons for a 283 are 1. 5 -1 with a roller cam . 060 over is pretty close to a 4 inch bore, a 305 bored . Also, all 305's have two bolt mains. 3. No reasonable or affordable way with a 305. 875" × 3. All for street, nothing wrong with them for that. 98 in a 9. Some factory 307's, some old 283's with a 3. Not an exact clone, but close. Strokin to 421 or 434 now that is the deal. 045 in the hole. Much easier project than to mod your original engine. Will the heads from the 305 work on the 350? What valves are in the 1986 305 G engine? I know it's not a Chevelle. 00 and i think Jegs sells a Pro comp crank 3. The crank was used in 305 and 350's and in 1979 -1982 267 cid Cast Nodular Iron Large journals 2 peice rear main seal . Body, Chassis and Mechanical. 0" rod) 350 block and a 400 crank, main bearing crank journals cut to 350 size given a choice a 383 or 396 stroker The 305 is a overbore on the 262 block, a well respected crankshaft on an orphan block. I had one that would run 307 ? The 1967 - 1972 Chevrolet & GMC Pickups Message Board. The 283 bored to 4" bore and stock crank would be a 302. It used 5. 25" stroke crank that was shared with the 327, however it should me mentioned that the 307 came out the year Chevy switched all small blocks to the The real 327 were 4" bore 3. 25 stroke ) using any haed-intake-cam combo and could switch cranks what would you do? . 480". That combination gets you a 302, as found in 67-69 Camaros. That would likely give you a bit more piston to deck clearance than the 305 and 307 are both 5. Standard bore on 283 and 307 is 3. The castings are not soft but they are not the same as a 327 or a 350, you can't bore them to 4", at least not most. The 307 is a 3. Profile Page. 60 valves and dual plane intake will make a good street engine I have been talking to people about building my 305 for my truck and my father-in-law has agreed to help me. Theres no reason to start getting into strokers. 565" or 5. Or you could just get a 265 or 283 and save yourself the trouble I would get a 327 block and put the 283 crank in it. 307 pistons are to small in diameter, however 307 are good little runners capable of descent hp and high rpms. A totally stock 305-307 SBC as you know is rather pathetic in both head flow and cam timing as most were designed as fuel economy combos, and most have restrictive exhaust. Running on E-98 with stock rods,crank,. 736. The 327 is a 4. The 305 blocks are 3. 250 inch stroke, and it too used the same 5. You could fly-cut the heads but this would cost more than a 350 block which 307 crank in a 350 block Engine & Drivetrain. Much stronger then the 283. These heads will choke a 350 but are just right for a 307. Of course it would take special pistons and you'd only end up with a 326. Won't over power a 10 bolt rear and Can I make a 335 out of my 307 ? Post by Tom68 » Mon Feb 27, 2023 5:34 am. A 327 is a bored out 307. It's sometimes possible to bore a 307 to 4 inches making a 327 out of it using older blocks. you can use a 307 crank and rods in a 327 block. 48" stroke. 48" stoke. Louis. Take 400 rods, a 307 crank and 283 pistons and you get short rod 307. 84. 94 x 1. 736 standard. that way you end up with a stroker motor. To make your 307 into a 327, take the crank out, throw everything else away, and put your 307 crank into a 350 block with 350 heads. I had a 67 engine I wanted to rebuild into a 4 bolt block, until I found out the 4 bolt block was large journal, and the I have not accually heard of that done. 5 to compression and iron heads is going to run like crap on pump gas unless you retard the timing 307 crank and 327 crank had the same part number. 48" stroke of the 350 crank. That gives me confidence to go on with what I've got. 040 bore and the 350 crank, you're ONLY about 13inches short of a 350! With off the shelf, mail order parts!!! Now, you can cam it and build Really? Everyone always said if you put a 350 crank in it it would make it a 327. I'd be happy to give it to him if it will work. Okay, I slapped some 305 HO heads on my 307 several years back and for $350, not much more bang can be had for the buck. 5 to compression and iron heads is going to run like crap on pump gas unless you retard the timing 307 has the 3. You end up with the displacement of a smaller engine with the rev limits of a larger motor. They had been Thanks for the replies. The ONLY possible advantage that I can see for going this route would be to have the bigger 68-later rods. Only drawback to building it is the availability You didnt say what heads you were using but you could always put some vortec heads from a 305 on there tho, that might help get some extra power and mpg out of it. since he's already got the pistons and crank, he's trying to figure out how to make them work together. I know the 330 crank is forged and you can swap it into a 350 easily. I also agree, the cheap route to performance is to find a 350 with a factory roller cam. You may be close and better off if you use light weight pistons. 030-over 305. You can think of the 307 as being a better performance design than a 305 since it has a little larger bore, but like I said before, it'll never be a real powerhouse, but 300hp at the flywheel is quite achievable with the 307. 94 and 1. 6. Nov 24, 2024 · I have done several large journal 327's on 350 blocks with a 307 crank . You would have spent money, that would have better spent, towards buying a 350. A 350 block with a 307 crank is a 327 which was a fairly common factory displacement in the mid and late 1960's. 283 stroke is 3. 000 inch stroke crank, so the compression height on the piston is 1. I have been talking to people about building my 305 for my truck and my father-in-law has agreed to help me. if you are looking for grunt and you have to use a 307,you could't do any better than to make it a stroker along with almost any bottom end cam. That is how the 307 was born. Also KB makes numerous pistons Though there is a difference in their stroke size, you can bore a 305 to a 327 with the right crank. <HR></BLOCKQUOTE> The 305 is a 3. Save Share It's no different what was used on a 283 crank is used on a 302, or a 307 crank is the same crank used a 327. I know there was some combination of stock parts that came up with a 383 sawzall, Jul 16, 2006. You'd have to carve the main journals to 283 size anyway, and then probably use large journal rods. Like Ford with the 289 turned A 307 crank has different counter throw balance because 307 pistons are smaller and lighter than 350 pistons. I have a 305 crank in the shop I will never use. Runs well. why would you want a 327 in a regal? fuck regals came with 305s. the 283 blocks are 3. Now, there is ONE I have just seen a 307 block for sale that,on criegslist,the seller said could be made into a 327. 250". I built a budget 355 with a stock 305 crank years ago and it had a slight vibration at 2500 rpms but ran strong. 875 inch bore. 740" x 3. Being a 307 and a bulk rebuilder reco I never had a lot of love for it and once it lost 307 not 327 You wanted to know about 307s it has a 283 bore and a 327 stroke basicallytruck engine originally equipped with small valves low compression and a two barrel carb it would not wind like a 283 or make the power of 327s. 5 to compression and iron heads is going to run like crap on pump gas unless you retard the timing block is a 3970010 which if I understand correct is a 69-80 350?? pistons are trw L3022F +. It was never built up for power like the 283 & 327. 140!!!!! Nope, won't happen. of maybe it was a compression modifier. 25" vs. About the 307 crank though does it have to be balenced alot because I remember you cant use a 305 crank in a 350 because the balencing fee out ways the cost of a new 350 crank. 350 flexplate on a 307? The 1967 - 1972 Chevrolet & GMC Pickups Message Board. Remember that 305 1. It's OVER 1/8th" bigger than a 305, which does have a problem, although heads with 1. Stroke it with a 350 crank, bore it . You could run the stock 307 piston with a 400 rod and the 305 crank. I put a 350 crank in and it (had it turned) and put the proper sized bearings in. The 307 does NOT have a 4" bore, however, although the 327 The 307s were built with terrible 2 carbs and crappy heads. You can bore 307, 0. 565 variety, Lunati has this bearing ) and it would match up , or Ohio crank sells a 5140 3. 875). Kinda depends on what you need it for. but they are far from being a total lost cause, EITHER! EXAMPLE pay attention to the bore stroke ratios, a 307 with its I know the easy way would be to find a 4 inch bore block but I have a standard bore 307 and I just picked up a set of . 140", and 6" or 6. 283 with 327 crank is a 307. Man thats alot of the info that I was looking for THANKS!! Hi all, I am looking at making an odd combination here. 000" and install a 350 crank 3. Cheap easy upgrade in power. 305 plus 307 piston pin height 1. 48 305/350 stroke crank you get 328 ci but it will not rev or be a high winder like the original 327 was with a 4" bore and the shorter 3. The 307 even at its stock bore will accommodate 1. Take the heads off a 305 H. People in the You have to take ALOT of weight off the crank to balance the rotating assembll to the 305 pistons. How about putting a 305/350 3. 56. com 68 Camaro 12-23-08 11:03 AM - Post# 1591240 Am building a 305. 45" and use the 400 short 5. Indeed the 307 was introduced as a big 283, the smallest V8 available in those years. The crank is bad. They always seemed to burn a lot of oil. The KB 283 pistons are $260 (pn The real reason for writing this is to ask, would it be possible to put a 350 crank into a bored out 307 and make it work? The bore measures a 4. By using the short rods you can use stock 305 pistons and the increased stroke results in 334 CID. It'll run. 25" stroke just like a 327. the guy would be better off finding a bare 350 block and putting the 307 crank and rods in it with 327 pistons to have a 327, or just building a 350. s. O. 94I and 1. I know the 307's crank is the same stroke as the 327. (A 307 crank would have a You know, the 307 had a 1/8th inch bigger bore than the 305, 1. 915, real close to the 4in bore of a 350. The cam wore down premature around 30K miles. 305 junk the only thing it is good for is basic propulsion and to make v8 sounds, riteous 140 or so hp. I've read this is a 400 crank in a 0. In theory, the 305 should produce it's best torque at a lower rpm than the 307. 0 crank pin to use a large journal rod ( of the 400 rod 5. make the 350's run on pump gas and give the small ci motors more compression ratio and the fule The 305 Chevy is a 265 stroked with a 350 crank. ] Aug 29, 2012 · Using a 307 crank (3. 74 bore block. Jan 6, 2004 · 350 and 327 have the same bore but different strokes (3. 48 stroke ) and one 307 ( 3. The connecting Rods on a 307 was same as the 350. The 307 crank in a 350 block would make a 327. 55 valves without having to carve on the upper cylinder bore. The 305 balance would be much closer. I am looking at using a sm journal 327 crank, 307 pistons . also with the smaller bore you have more water around the bore and sooo it runs It appears that compression height on the 307 piston is what would hold this back. The 307 ran a 2G or 2GC Rochester carb and used a 2 piece seal crank and block. If you use the 3. It became a 307. 875" and the 327 crank 3. A 307 A small journal 307 or 327 crank should drop right in, use 307 pistons. 96 deck height. Find a used 400 crank have the mains turned down to 2. For example, if you bored it . If 1 horse per cubic inch is ok with you,then how many cubic inches does your car require? the factory pistons and you want basic street performance with nothing wild then slap a set of 416 casting heads off a 305 on it, add a Summit 1102 camshaft, double roller timing set, small tube headers with dual 305/350 then 307/327 then 265, 283 and 301/2 with respect to rpm quickness, that's all. The 307 was bored out to 4” and a large journal forged 1178 crank with a 3” stroke replaced the factory 307 crank. 010, havent checked those numbers but am guessing that have to be the correct ones for the 307 crank first your putting 307 pistons in a 350 block. What you get is a poor bore-to-stroke ratio and relatively small displacement. o. GM started doing the same thing. So, as you can see, the 307 block makes a MUCH more logical choice than a 305 block-----but look at how many times you see people try to extract big numbers from a small bore 305!!!!! DUH, I don't understand it! And, while we're on the subject, you could use a 305 crank to build up that 334 from a 307 (a good machine shop can easily balance I'm assuming you want a longer stroke crank for your 307. Heads. 800, the compression distance is measured from the center of the rod pin to the top of the piston. 48") plus they have high nickel blocks. You could build a large journal 283 with a 307 block and a LJ 302 crank from a 68 or 69 302. The 307 Chevy is a 283 stroked with a 327 crank. If you research what all the car mags have written about the 305 and how The heads may or may not work for your accessories, but they'll work fine on the engine itself (a 283 has the same bore as a 307 and is slightly larger than a 305). It's OVER 1/8th" bigger than a 305, which does have 69 -307s have decent compression. Register or Log In To remove these advertisements. Fire it up! : Just run it. the 307 has a bigger bore than the 305 but uses the smaller crank. Any money spent on a 307 could also be spent on a 350. Point being; it's an over square design, just a little down on cubes, at least to us spoiled ass Americans. Why not use the 305 balancer on the 307? Also use the 305 front cover. 562 crank for around 375. 7 rod or the 5. 030 327 pistons for this engine. it seems a 350 would be much easier and cheaper to accomplish. To bore a 307 all the way out (an additional . I didn't talk to the person who listed I think there is some confusion between the 307 and the 305 when talking small bore. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 Lot of work the 305 is an injected, one piece rear seal crank and block. 875. SHARE POST #7. Cast crank never had a issue . 94s and . A number of these engines have been build and it sounds like the owners are happy, but I've never found one to talk to. 030" milled off, edelbrock c3bx intake that was virtually left for dead in my garage, duntov 30/30 Also a 307 is a large journal version of the 283 block with a large journal 327 (3. 030 over 265 pistons if the bores are worn. Then the pulleys will fit. 350 heads. You could buy a custom built 283 from a host of builders including mail order outfits. Maybe some late 80's "performance" 305 heads would work well on a 307 short block . The 350 is a 4. 025 deck block is . The 307 was a merger of the 283 block and the 327 crank. Being a 307 and a bulk rebuilder reco I never had a lot of love for it and once it lost I have a nova only 283 block with a cast crank and forged rods, the current cam is the original cam and according to everything I have found, was used in the 195 & 220 hp 283 and 250 & 300hp 327, this is a low lift long If you would consider replacing the engine, it would be great to put the crank from your 307 into a 350 block with 350 or 305 heads and run a 327. Guys used 283 block and drop a 327 crank. 25 stroke, same as a 327. 48" stock. Drivetrain & Performance . horsepowerinnovations. you still need to get balancing work done though. E85 racer and E85 carb builder www. and put them on a 307. Well a 283 and 327 share the same 3. Although the stroke length is different, you can get a similar The 307 also used the 3. com: User Name: Remember Me? Password: Home 307's are only half as bad as a 305. Put the 327 crank in the 283 block with the 305 heads 1094 head gasket and a quadrajet. making a chevy 350 into a 302 For folks following this thread, I’ve discovered that the 307 was actually built like a ZR302 Z28 engine. The stock 400, 350 and 305 all have the same piston pin height at 1. 750 if you overbore the 305 . However the small I don't have a 350, or a 305, but a 307 in this thread in this sub-forum in the entire site. Maybe the crank is actually a 327 or the engine is actually a 350. 75" of rod stroke to it, is not going to make the little mill any happier. Jun 17, 2007 · The 307 on the other hand with it's larger bore than the 305 has more room for the cylinder heads to breath, hence the ability to make more power over the 305. High stepping 307 that sips gas. 030 over silvolite pistons and rings for $75. 307 street build opinions The 1967 - 1972 Chevrolet & GMC Pickups Message Board Register or Log In To remove these The 307 was a 283 block (the bore size) with a 327 crank (stroke size). All chevy did was A 283 crank in a 327 block makes a 301 (with stock bore) the sreamin'-ist little motor known to man! But the 307 is actually a 283 bore with a 327 stroke, came out when they enlarged the bearing journals so it shares with the 350, and I've found a couple of stroker kits for the 305, but some say 334 and some say 335. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 . I'm planning to build this engine,the heads will give about 9. There is also a 307 produced by Oldsmobile A 350 yes, put a 307 crank and 327 pistons in it. It was never highly thought of in the day. a 307 . The 10 inch or 11 inch clutch on same flywheel? The 1967 - 1972 Chevrolet & GMC Pickups Message Board 307 ? The 1967 - 1972 Chevrolet & GMC Pickups Message Board. a 350 block and a crank from a 307. So, 350 block. 00, 307 is 3. squirrel. There are a few the 305 and 307 sbc engines are far from the ideal starting points for a performance engine build-up. Joined: Sep 23, 2004 Posts: 57,646. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 86 up is smooth round crank end with a new one piece rear main seal '85 down is large flange type with the old two piece rear main seal design so if the 350 is an 85 down then you will have to get another flex plate or I have a set of 305 HO heads that I am planning on using with this 307. 7 rods, your 327 pistons and you have it. I spun it to 6500 rpm many times and it held together. 995". just get a 350. In Mortec say with is a 307", but the crankshaft is a 350" and the cilinders have 3. 020 below deck and so on. 030 or . Requireing a longer duration cam and higher compression ratio (piston). Half the stroke 3. Save Share 12-23-08 11:03 AM - Post# 1591240 Am building a 305. The best setup I've had on mine so far is 461 camel humps w/1. I went out to check the crankshaft flange like someone said to, then looked at 305 junk the only thing it is good for is basic propulsion and to make v8 sounds, riteous 140 or so hp. The 307 uses the 283 bore 3. 25 compression with stock flat top 307 pistons that sit . I have a 350 First off, the 305 and the 350 do have the same stroke (3. A 307 bored . 120 to 4 inches and using 327 pistons in it, or using the 307 crank in an old 350 block and the 327 pistons. 625", & you get 8. That was pre-smog era. the 305 crank is ballanced differantly and has slightly differant counter weights, the damper and timing marks may differ on some combos, and the 305 crank is not designed to ballance correctly with the rest of the 350s rotating assembly, and it possiable that youll need a differant damper and flex plate, youll need to reballance the I have a rebuildable 1970 307 engine and a set of 60 cc chamber #658 Power Pac heads. I'll try to find a good 350 block and a 307 crank and rods. if i had them both i would build the 307!!! 3and3/8s bore and 3and/1/4th stroke. 020" shorter than stock, The 307 was a stroked 283. 91", is very rare, this engine are installed in Camaro 1970 RS but I dude is this 307 or 350? I have many pictures of the engine for you can see and help in the oppinions, this engine is very diffrent at my other 307 (3932373 with crank 307"). ALLIANCE MEMBER. Some nice small chamber heads off a 305 HO, a moderate performance cam, and a decent intake and carb can Long answer: The 307 has a larger bore (it's a 283 with a 327 crank, the 305 has a 350 stroke crank) so there's less valve shrouding. 02/1. 740" bore and 3. chevy built them from 1968-1974, then they were replaced in the engine line-up by the 305, a 350 crank in a 3. 25" stroke) crank installed. 125" oversize which I'm not sure if you can get away with and still have enough wall thickness on your cylinders. Ok guys if you had to buld one engine and had one 305 block with crank ( 3. 307 just didn't start out as a 283; and it has the large journals of the later model SBC. Reply reply Candid-Lime-3414 • I've always wondered how that works. 013"-. 01 but would probably want to use . Bore the block 0. You can bore it and keep your crank, or, you can bore it and literally drop in a 350 crank. 125" to 4. I also found this on another website: Chevy should have built the 350 using the 327's 3. Although a guy I know claims to have done something similar. So it is effectively the same as a stroked 283 with a small journal 327 crank used for the stroke increase. The 2500-4500 rpm range. It also has same stroke as a 327. Only the 307 and 327 used the 3. A stroker 283!!!!! If you have a that much $$$ to spend, just find a running donor 350 for less than upgrading heads, etc. 75" (5. dave Some are getting worked up over large journal vs small journal. 060 over. That will give you the best of all three engine choices; all things considered and mileage on top. 5 heads are made for the 305 A 305-307 ci motor could be competitive against a 350 if it was allowed to run a domed piston and higher compression. 562 and use a bearing that allows a 2. 25 crank, too, and just a 3. 875" bore and 3. The 307 as said has a 3. Just will not be a crank. 283s and 327s are 60s engines. So, you can quickly see, a 307 is a much better block to start with over a 305 block. 25 crank. 0 compression and rates a 200 or 210 gross hp with a 2 bbl carb. you don't plan sincerity. A friend in high school hsd one in his Nova, all hopped up, pissed a lot of guys off if they ever did beat him he just said they beat a 307. my suggestion re-ring and re-bearing the 307 and do the 305 heads for good flow, 190 intake runners with 2. Let someone else do all the experimenting and you reap the benefits. The KB hypereutectic pistons for a 283 are 1. LOL. It's not that you can't bridge the gap between the old and always leaky 2 piece seal crank and whatever tranny is in the Camaro it gets to be a PIA pretty quickly fixing all these little but substantial differences. 565 rod length = 7. scat 350 crank 416 casting 305 heads* flat top pistons performer rpm manifold* Q-Jet carb* The items with the star are the parts I all ready have. 60 valves and dual plane intake will make a good street engine My brother has a 305 in his Camaro that is a p. they're only cool under the OH WOW great post Dave. I suppose you could stroke the 307, or something, but the small bore makes it pretty worthless in that respect, too (although considerably better than these WORTHLESS 305 stroker 305 junk the only thing it is good for is basic propulsion and to make v8 sounds, riteous 140 or so hp. It ran a lobe back about then, it came in a car I bought in the late 80's, so a few 100 thousand miles some on Propane. 400 block and a 350 crank with "spacer" main bearings 383 = 4. 25" stroke} I built a customers 305 that ran very good, i suggested a 355, his reason was the 305 was the matching numbers engine for his car. 0 motors the 350 is a 5. 6E will do fine. but why a 307? Young friend of mine is rebuilding a Chevy 350 and he needs a crank. A flat top piston'd 327 with 76CC chambered heads is going to be a turd. you seem to be missing one thing- a stock 307 has a 3. czech If you could bore it ?? a 307 piston would be closer because of the 3. . 562 crank for 307 ? The 1967 - 1972 Chevrolet & GMC Pickups Message Board. If you wanted a small bore engine with a longer stroke than a 265 had, you'd be well off to look into a factory 307 or 305 engine. A lot of work and money for less cubic inches and horsepower. Aftermarket cast pistons for 307's run 0. 94/1. Deck it . 060 oer is no where near close. 030" x 3. Better bore / stroke ratio (3. I just like the 307 for some reason. You end up at a 8. on the 307. 020" shorter than stock, and they cost close to $300/set, and correct-height forged 307 pistons cost ~$400/set. Same for 283 powerpack heads. 060 over and drop in a 350 crank, you The best thing to do with a 307 block is to sell it to a guy who races a 305 in Stock or Super Stock. 480" stroke crank. It's been hanging around for a while now, 2010 on the oil filter. The 305's were cheaper to produce since they shared a crank stroke with the 350. I just took out my 327 last summer in favor of the original 283 I thought of using the 327 crank but then was talked out of making a 'stroker' 307. 25", you could put in a 350 crank, with it's 3. If I go the 305/350 crank route, 400 rods, and use a very thin (not sure which one to use) headgasket, approximately what compression will I end up with? I don't plan to deck the block. 305 vs. A moderate cam and 4 barrel,decent exhaust ,call it 240 hp and should be ok in my 50 Chevy PU. 20230226_113320. 0 inch bore, like a 350, and the crankshaft flange, is not a 307 crank, but a 350 according to an article in car craft. Then you could use big valve The 307 is similar to a 305 - they make ok power for what they are but struggle to make 1 hp/1 cubic inch due to the lack of good flowing heads and small valves needed to fit the smaller bore size. So you will need to buy . ) It went into my wife's '72 nova, then later into my pick-up truck. Can I make a 335 out of my 307 ? Post by Tom68 » Mon Feb 27, 2023 5:34 am. 030, . 740" bore is unique I understand the concept of stroking a motor but a 400 crank in a 305. 875" bore so putting a 305/350 crank in it won't give you a 350 without boring it . That means you need to A 283 crank in a 327 block makes a 302 and a 327 crank in a 283 makes a 307. 736"× 3. i think that is a good combo. A 305/350 crank will only work in a large journal block so if you have a 67 or earlier 327 a 305/350 crank won't work. We ran 1. A 305 crank will fit into the block but nothing else will work with it. what do you think The 283 came with a 3. Don't get me started on bearing sizes, thats another topic. The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain: 307 crank in a 350 block Web 67-72chevytrucks. GM only sells 305 or 350 crates engines today (but you could put the 307 crank in a 350 block and get a large journal 327). One ran 12's in a chevelle years ago was 12. You can not put the 400 crank in the 307 block because even though I said it was a large journal block, the journals are too small to accept a SBC 400 cast crank. However, he says that I should get a 350 with a 327 crank, at least a 4" bore, longer rods, etc. ABSOLUTELY!!!!! Because the 307 starts out with a 3. not sure. 7" or 6. 030 over 350)?? rod bearings are clevite 77 CB663P . But, a . Just to get a 305 to the same bore of a 307, it has to be bored about . 48" crank in the 307 block? Could I use the 307 piston with the 400 5. The only problem GM did is to use a soft cam. 875 bore and the 305 bore is 3. They have different main bearing sizes or somthing like that so it would be easiest to find an old 327 block and crank rather that trying to fit a 327 crank into a 350 block . The 283 crank has 3" stroke. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic A 307 is a 327 crank put into a 283 block. use 5. Take 400 rods, a 350 crank and 307 pistons. I don't know of anyone making pistons to use a 350/305 stroke crank in a 283 block. The yes the 305 crank can be used,BUT. 040 is 3. 84 valve heads work well with their small chambers and larger ports, and are very cheap on ebay. 25" of stroke. Also the 307 has a 3. Confused? In the early 60's 283 and 327 were plenty. The 307 does have the same bore as a 283. The small journal 327 crank and the large journal 307&327 cranks are the same My engine book shows the 307 was essentially a 283 with a 327 crankshaft. A 307 is essentially a 283 with a 327 crank. 7 inch rods which results in a 1. 736 bore x 3. 75" stroke 400 crank into a 305. Thanks for the tips, I appreciate it. the practical thing to do is use the light 305 or 267 crank and have the pistons made. A better combination is the 283 crank in a 327 block. If you bore a 307 . 50 unported heads I can't remember what stock rods we used (but I can find out w/a phone call) A 307 is just a 283 cylinder bore with a 327 crank {3. I have some 265 power pack heads but will probably go with either some 305 heads or some Vortecs. Nice little high revving motors. At 4. 040 and, BELIEVE IT OR NOT-----use the shorter SB400 rods. You'd probably have to clearance the block for the extra 1/4" stroke of a 350 crank, special pistons all for probably somewhere around 340 cubes. Yes you can put a 3. 030 bore (. A 350 crank would require 350 rods. 307 is just a sbc same as the rest. 020 and use the And imho, that 307 w/ a 350 crank engine at 328"s is NOT a bad engine at all IF you build it for torque which it should produce a lot of!! I think there is some confusion between the 307 and the 305 when talking small bore. I built a 262 with a 307 crank shaft in it and never worried about the balance. 565" rod and the 307 crank arm length (1/2 the stroke) of 1. 120 in compression height. A 305 would need to rpm much higher to move as much air as a 350 does. 000" bore and 3. 040, . No matter what you do, be sure to have it balanced afterwards. It couldn't get out of it's own way, due to the tiny bore. 25 stroke. 74 plus 5. I was wanting to build him a nice 327 instead of a 350 for its reputation as a fast reving, fun engine. However, a 307 is no match for a 350. 805". (the 327 3. It is not possible to bore a 305 to 4 inches. You could fly-cut the heads but this would cost more than a 350 block which would take the 305 crank / rods with 350 pistons Re-block it Kerrynzl, Apr 16, 2013. 43 cubic inches is too much of a handicap. Engine. Since 350s are so common, the pistons are a stock item in the aftermarket and are cheaper than the you should consider using a 350 crank instead of a 327 crank. 30 over lunate bracket master2 230 lift and 480 duration, 305 ho heads that have been port matched on the ext and the cast number is 601, edlbrock performer rpm, quadrajet 750, 2200-2500 stall, stage2 b&m shift kit, long tube headers 3 inch purple hornys, richmond May 28, 2016 · 3998993 (1972-1973 307/350, 75cc) If I had a good running 350 engine in my car already I would purchase a set of number and letter stamps. 350 is same stroke as 305 but 305 bore is smaller. What's New; Forum Listing; Marketplace; Showcase; Gallery; Advanced Search; Members; FAQ; Dark Mode Light Mode Menu Log in Register Home. With a . one thing the 305 has a longer stroke. If you can post some block casting numbers and cylinder head casting numbers I’ll be happy to decode this and see what’s going on. Follow along and see how much horsepower it made. Based on where you look it has an 8. think of it as a 327 crank in a 283 block. They'll yea i would go with the 307! thicker heads! those 305 heads are very bad to crack. 565 rod. Tech Help. ) (305-318) engines got a 150 pound weight break. The 307 is an OK SBC, but I'd suggest using 58cc heads from a mid-80's 305 with 1. No cheap way to make it work using either the 5. 9 that many engine builders seem to like. Joined: Aug 25, 2006 if one got first your putting 307 pistons in a 350 block. The 305 already has the same stroke as the 350. 75 ratio, better than a 350 but still short of the "magic" 1. I had The 307 didn't come out until 68, thus, your engine has the large crank. 060 bore is plenty safe. You'd still have to bore it to 4 inches to make a 327, and like we just got done saying, you can't do that. Or, make it into a 327 by boring it out . I know that both engines have the same stroke and journal The 305 bore and stroke is 3. 0 inch rods are fairly common in the aftermarket and would improve the ratio to 1. 307's have the same lenth stroke as a 327, which is 3. The crank of a 307 is a large journal crank with 3. If you must use those heads, you will need to run a domed piston to keep your compression up where it needs to be. Add this to the 5. . I thought that a 305 crank in a 350 gave some other displacement . Best of The 283 came with a 3. 125" rods. Throwing another . After running it there is a noticeable vibration around 3000 rpm and the oil pressure keeps dropping (was way above 50 psi) and there is something dark looking in the oil possibly metal from the bearings. jpg. [305 to 430 ] back on subject 283 or 327 [guess which] And you can pull the engine without removing the hood or front sheet metal [just the radiator support panel] Using a 307 crank (3. I have a 283 block, same casting as a sm journal 327. 25 stroke but you would still need to lose 0. It is possible to use a 400 crank in a 305 to stroke it, I'm pretty sure it comes out to a 331, somebody sells the kit. if you use the heads off of the Work to maximize power in the range the 307 can do well in. 307 crank. This image is looking at the bottom of the sump from what is normally the front of the motor in a car, My brother has a 305 in his Camaro that is a p. 565" rod and a 3. Forums. buffhtmybowvgtqowgsueoctriudlcbvsypfqnbjmdvmywqbjgouc