Quote:
Originally Posted by Warrens69GMC
The 307's of the 68-70's got the 185 heads and I belive they were equipped with 1.72"I and 1.5"E valves.
The 305 heads from the 80-86 HO motors (416 casting) had 1.84"I and 1.5"E valves.
On a rebuild using the flattop piston that will yield 8.7:1 with 64cc piston (.04 compressed gasket, -.02 in the bore) you can achieve ~9.4:1 with its 58cc chamber and choosing a head gasket with a ~.030 thickness.
Both of those items will help the 307.
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See thats why i joined this forum! Good help and a lot of knowledge!