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Old 06-29-2008, 11:02 PM
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building 307!

i am was wondering how to make a 307 stronger maybe stroker?
right now i have edelbrock 4 barell/plus intake.

anybody around here has buld a 307 or can help me build it and go and make it stronger

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Old 06-30-2008, 01:37 AM
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well if thats all you've done so far it looks to me like your next step is to build yourself a new exhaust system, some decent headers and free flowing dual exhaust would help out alot assuming you're running iron manifolds right now...
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Old 07-04-2008, 07:50 AM
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Chevy 307? Olds 307? What kind of car?
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Old 07-04-2008, 05:13 PM
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why would you want to spend the money on it like that.. if your talking of stroking it and all that, why not just start with a 350, be easier, cheaper and make alot more power..


if i had a 307 or 305 that was in a vehicle and already running, a set of aluminum heads and a roller cam
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Old 07-04-2008, 11:54 PM
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Basically the 307 technicaly is a stroker already, being that it shares the same bore as a 283 -- 3.875 inches. If you're dead set on building this engine your best bet would be some decent flowing heads like World S/R torquers: http://www.jegs.com/p/World+Products...10002/-1/10187 and maybe the Comp cam 268H if you want something with a tiny bit of lope to it.
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Old 07-05-2008, 12:02 PM
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I don't recommend putting big heads and a big cam in any 307 and killing your power below 3000 rpm. If you are going to build an rpm beast, I'd start with something different.
The cheapest way to power is a running salvage yard Chevy 350/5.7, preferably a roller vortec. If your trans will bolt up.
(I can only guess your 307 is a Chevy.)

For any 307 I would go a good "RV" cam (consult the cam companies) and good small diameter (1 1/2) tube headers with extensions and H pipe, turbo mufflers to complement a straight Performer intake. (not RPM)
Transmission type and gear ratio is very important to seat of the pants feelings.
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Old 07-05-2008, 12:56 PM
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If it runs good,you can make a nice stout mild performer with it. Put a mild cam in it with like 218@050 intake and 460+ lift.
Edel perf intake,600vac Holley and 1 5/8 headers.If you wanna get a little deeper in,maybe have a few thousanths shaved off the heads to bump compression 1/2 point.If you can or have a freind who can maybe a mild porting to the stock heads but I wouldn't pay a shop to do it though.
For more than that,your better off starting with more cubes.I wouldn't buy heads for 307.Not to mention allot of 307s used the same heads as 350s so a 1.94 intake should be plenty for the little 307 and 2.02s would prolly be bore shrouded anyways.
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