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Just finished installing stock Z-06 in 97 coupe. Used existing headers, absolutely no problems at all. Of course I'm going to have to get an LS-1 edit to reprogram computer so I can get the higher RPM and fine tune the computer to fit my car.
What class are you talking about? I autocross my car and plan on racing SCCA soon. So I'm most interested in class your building for.Chuck
That said, check to make sure that LS6 parts on an LS1 block are legal. I know that for SCCA's ASP class, such a conversion would *not* be legal, but perhaps for your rules it is.