Should I run a C4 or a C5Z06 'vette in Stock?

[BlueOval Ralph]

It sure was ALL Z06 have had same engine internals since day one, know that for a fact. Only Change was early had cast pistons later have forged.

Originally Posted by james schaechter

I didn't think that was the earlier version, but I am not a Vette expert at all.

I would hope that the CNC heads bring the NHRA factor down like it did for the4.6 Fords! Knock about 50 hp off! LOL.