[Jim Sims]

The thermal expansion coefficient difference between steel and aluminum/magnesium remains. Dilivar is one solution; the other being higher strength alloys for the studs combined with thread inserts in the case to brute force (strength) a solution. Dilivar has to be protected from corrosion; the new studs come with a different coating compared with the originals. The Dilivars in my '76 2.7 engine are hanging in there but they were carefully re-coated when the engine was apart to address the generic 2.7 engine weaknesses.

When replacing broken Dilivar studs without a bottom end rebuild then using the newer Dilivar studs is a reasonable repair; merely substuting steel studs runs the risk of converting a broken stud into a pulled stud.