This engine was in need of new head studs, so I thought I'd give the ones from ARP a shot. Before ordering, I called the R&D at ARP to ask about their properties compared to Dilavar. In a nutshell, I was assured that they'd do just what the Dilavar ones do, only better, and that they are made out of Inconel. How Inconel matches Dilavar as far as heat expansion properties is beyond me, but since ARP knows their bolts and this engine is of the not-so-stressed 964 type I figure they'll do their job just fine. If anyone out there has experience with these studs I'd be interested to hear from you. Cheers.