[ariZona28]

Recently a buddy of mine had his 26K mile '06 Z06 fall victim to a dropped valve and catastrophic failure. He was nice enough to give me the undamaged cylinder head from the opposite bank. Eventually I'll do a bit of detective work to find the differences between the early and late versions but there is an obvious difference when you look at the 8452 casting number that is visible on the passenger side. The first pic is the C6 Z cylinder head, the second is the head from my '15 Z/28. I've looked at a few early C6 Zs and they all have casting numbers with a more defined stamping like the first pic. I have yet to look at any Z/28s as they're a bit more difficult to find. Maybe some fellow members can post some pictures as this could become a quick reference as to production time frame.