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Originally Posted by Jake Raby
at 3.6 the 3.2 heads are on the verge of not being effective without port work and larger valves. At this point the engine gets close to the edge of inefficiency and a narrowed powerband from the smaller port.
The combustion chamber of the 3.2 head is such that it nets an 11:1 CR factory, when you go up in displacement with that same size chamber without a specially prepared piston CR can see 14:1!!
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This is why I started with a 996 3.6, that and the ability to have the newer vane type VarioCam and VarioCam Plus.
CC'ing the heads with the JE pistons yields 12.8:1 for me.