[vytenis]

I have Wayne's book and have read a number of posts regarding "the ticking time bomb" of Dilivar head studs. I have an '87 911 with Dilivar lowers.

Quoting Wayne from his parts catalog "As the displacement of the 911 engine increased over the years, the increased stress caused by differing thermal rates of expansion often caused the head studs to break or separate from their mount in the case. This often resulted in a leak between the piston and the head. Porsche decided to solve the problem by using Dilavar studs. However, there were reports of these studs breaking under pressure prematurely. There are a few good solutions. You can replace your studs with the standard Dilavar studs that the factory began using in 1984. Or you can use high-strength aftermarket studs."

I've read that they keep making the Dilivar studs better and better. I'm doing a top end rebuild at 100K miles (and while I'm in there) and don't want to cut any corners. Nor do I want to drain my bank account unneccesarily.

So are Dilivar studs after 1984 OK for use on a stock engine configuration?

"V"