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Old 11-27-2012, 10:35 AM
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Originally Posted by ChevelleSS_LS6 View Post
Found an article on a 307 build. Not superhero power, but I'll bet you could actually afford to drive the thing how fuel prices are (grrrr!).

307 Chevy Dyno Test - Super Chevy Magazine
This 307 could have made a lot more power if better parts and attention to details
had been done.

The resulting engine compression ratio was less than 8.5:1

8.5:1 is way too low... you want 10:1 with that cam on a 307.

This engine should have had a supercharger on it.

if the heads had been milled to 51cc (.041" gasket) or 56cc with a .015" gasket to get the compression up it would have made a lot more power and torque. 10:1 minimum compression ratio.
A finished 10.5:1 compression ratio would not be too much for this motor. (92 octane gas)

Bad intake and carb choice. The lowly performer manifold and 600cfm carb are bad choices when you want power. even on a 307.

A Performer RPM high rise dual plane and 750cfm carb will make more power and torque. Always.

This engine could have made well over 350hp if attention to details and parts choices had been better.
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