Re: 383 heads: 64cc vs. 72cc
Assuming the compression ratio is the same my preference of combustion chamber design is as follows:
1. D-dish piston, small combustion chamber
2. Flat top piston, medium combustion chamber
3. Dome piston, large combustion chamber
4. old style dish piston (no quench pad) and small combustion chamber
There has been some tests and some debate about how much (if any) advantage there is to a D-dish piston over a flat top piston. I personally believe that if the compression ratio is the same the D-dish has a slight advantage due to combustion chamber shape -- being more compact in the center of the chamber will IMO burn a little faster and more efficiently than a larger, flatter chamber.
Pretty much everyone accepts the idea that the design of the combustion chamber makes a big difference in power production, but a lot of the time people forget that the cylinder head is only the "top half" of the combustion chamber -- the piston crown makes up the other half.
E85 racer and E85 carb builder
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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle