Quote:
Originally posted by SBC
I thought the problem with the 307 was the low compression heads of the EPA era, not the displacement.
The last recipe I got was 283, .030 over, 327 crank with 2.02 intake heads.
But I don't think .030 over will clear 2.02 intake valves.
Bert
The low compression is part of the problem. Intake valve clearance to the top of the cylinder wall with big valves is another. That limits your choice of heads although a good set of ported 1.94s would work well on the street. If you put 2.02s on a 283 bore check your valve clearance very carefully. Performance pistons for the 307 to bring that low comp up a little are almost non-existant too. A combination of decking, milling and thin head gaskets working towards a 9.3 range CR would probably make a pretty torquey 307. Match the cam and induction well and it could be an interesting combo. It's just always been thought of as a lot of work and expense to get less results than a standard 350.