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Old 01-20-2003, 02:32 PM
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Post 307 cranks

are all 307 cranks steel or just certain year and what strocker combonation avialable for it <img src="confused.gif" border="0">

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Old 01-20-2003, 03:34 PM
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All 307 Chevy cranks are made of Detroits wonder material, cast iron, there was never a high performance version made, so it didn`t need a forged steel crank.
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Old 01-20-2003, 04:23 PM
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Didnt the 307 use a 327 crank but smaller bore. Wouldnt a 350 crank be a strocker kit for it??
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Old 01-20-2003, 04:49 PM
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307 was the combo of 2 engines, 283 bore, 327 stroke, to stroke a 307 with a 350 shaft would require custom pistons so high $$$, why do this when you can build a 350 cheaper and get more cubes and power for less money?
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Old 01-20-2003, 04:54 PM
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i guess i was told wrong about 307 cranks being steelfor some reason ithought you could make a302 with that crank &283block <img src="confused.gif" border="0">
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Old 01-20-2003, 05:49 PM
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283 cranks are usually (or always?) steel. Drop one in a small-journal 327 block and you'll have a 302. However, you'll need custom pistons or rods. (I think you could also do this with Gen2 stuff: 350 block, 265 crank, 5.94" rods, and stock 350 pistons.) Are you looking to build a 302?

[ January 20, 2003: Message edited by: RedRocket ]</p>
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Old 01-21-2003, 08:19 AM
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why not go the other way around, instead of putting a 350 crank in a 307, put a 307 crank in a 350, garunteed it would be cheap to build and it would have more power than a 350. it can be done im building one righ now.
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Old 01-21-2003, 09:08 AM
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[quote]Originally posted by chevyman17:
<strong>why not go the other way around, instead of putting a 350 crank in a 307, put a 307 crank in a 350, garunteed it would be cheap to build and it would have more power than a 350. it can be done im building one righ now.</strong><hr></blockquote>


Why destroke a 350? Basically you then have a 327. I dont see the point.
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Old 01-21-2003, 10:15 AM
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if you put a 307 or large journal 327 crank in a 350 block, it makes a large journal 327, they reved faser than a rebuild 350, and lasted longer, plus had more horsepower, i have one that has 375 hp, and i spent under $700 on rebuilding it, i have it in my 1969 chevy pickup, and i smoke who ever pulls up to me at the stop light, trust me its worth it.
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Old 01-21-2003, 11:18 AM
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Hey Joe! There is nothing wrong with the cast 307--327 large journal cranks, they are good to around 400h.p. When the 400 chevys came out everyone said that the cast crank wouldn't stand up in a built engine! How many original 400 cranks are runnin' in some hot 383 and 400 inch smallblocks right now? So don't worry to much about this crank whether you build up a 307 or use it for a 327.
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Old 01-21-2003, 11:56 AM
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[quote]Originally posted by chevyman17:
<strong>if you put a 307 or large journal 327 crank in a 350 block, it makes a large journal 327, they reved faser than a rebuild 350, and lasted longer, plus had more horsepower, i have one that has 375 hp, and i spent under $700 on rebuilding it, i have it in my 1969 chevy pickup, and i smoke who ever pulls up to me at the stop light, trust me its worth it.</strong><hr></blockquote>


Okay, but an eqaully built 350 would make more power. It is just the laws of physics. More leverage on a crank shaft yeilds higher torque. Same reason an equally built 383 or 400 would make more power.

I will give you that they will rev higher, but I think the anyone building a sbc that has the parts should stick to the longer stroke.

BUT, do whatever floats your boat. We all have different preferences.

As for the 307. I would look into using a 350 crank for it. It would be very torquey and make a nice street engine if you can find some pistons.

Chris
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Old 01-21-2003, 12:19 PM
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Hey Chris! I know what you are saying ( no replacement for displacement) but I have seen 350's get out ran by similarly build 327's in some fairly lightweight cars! I have also seen some bad little 289--302 mustangs blow away bigblock stangs! I guess that I am just partial to 327's because that was the hot smallblock when I was growing up! But, have you ever driven a 302 Z/28 Camaro? They were more than a match for most 350 Camaro's! So there has to be something said for the High-Revving engines!

[ January 21, 2003: Message edited by: OddRodder ]</p>
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Old 01-21-2003, 12:24 PM
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i remember a post here not so long ago on that very topic, and there are indeed pistons for that somewhat oddball combination, ill try and sift through old topics and see if i cant find the link..

but if you have the 307, and the 350 crank, and the will and desition to do this then go for it, just remember that you can buy a 4 bolt 350 goodwrench motor with 275 horsepower for 1750 bucks, and it comes with a 3 year & 50.000 mile warranty. just something to considder before comitting to a rebuild that could prove to cost arround the same before you are through buying: pistons, pins, rods?, rings, cam, lifters, timeing chain, mashinework (boreing, honeing, cam-bearing install, hot tanking, decking, crank ballancing) gaskets, paint and what ever chrome stuff you decice you must have for your new engine............

i would just get a goodwrench 350, install it and be done with it..

just my 2 cents.
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Old 01-21-2003, 01:22 PM
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[quote]Originally posted by OddRodder:
<strong>Hey Chris! I know what you are saying ( no replacement for displacement) but I have seen 350's get out ran by similarly build 327's in some fairly lightweight cars! I have also seen some bad little 289--302 mustangs blow away bigblock stangs! I guess that I am just partial to 327's because that was the hot smallblock when I was growing up! But, have you ever driven a 302 Z/28 Camaro? They were more than a match for most 350 Camaro's! So there has to be something said for the High-Revving engines!

[ January 21, 2003: Message edited by: OddRodder ]</strong><hr></blockquote>


In a light weight car they can be made to run very well. I have never driven a 302 Camaro. Since there were so few made I probably never will. Those cars also got better induction components and cams that run of the mill 350. There are alot of guys who love the small cid high reving combos. I just prefer the longer stroke higher torque. It is all in the combination of components. Read throught the old stuff. There is alot of debate on this topic.
Chris
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Old 01-22-2003, 05:31 PM
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Thanks for all the feedback guys you have givin me lots of diffirent options all unique in there own ways shure glad to be on this forum 4 door
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