Depending on the piston to deck height(which I'm not sure is dependant on the piston or the block) if its .020(A6 height) then the compression will be 11.3 if its .040(the ZC height) then the compression will be 10.8. Using desktop dyno the jump to 10.8 should get you about 10-12hp over what you got at the flywheel, the 11.3 will get about 3-4hp over that. This was based of a d16z6 engine though so the results could be a little off, I doubt by much though.
The ZC produces more HP out the box so if you changed out the internals you could just bolt on a turbo you could make some real good power.
The A6 can make about the same HP if you swap on a VTEC head. Then the increase in compression will get you more power and still be N/A and still have the ability to use nitrous when using some High ass octane or some kinda substitute like toluene.
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