Originally Posted By: Greg Hogue
That main girdle looks great. I have a question about using aluminum the expansion rate vs cast iron in something this long. The head floats on a head gasket but the mains need to be rock solid. Is there another of those main girdles floating around? I would be happy with a print.
I have opened our engine up and it's to say the least interesting. I would guess 40 maybe even 60-year-old thought process




Those types of girdles are very common on inlines and Flathead Fords for Bonneville racing, and the dissimilar aluminum vs. iron material is a non-issue as much as Rodeck and Donovan aluminum blocks with steel caps are a non-issue. Guys in Brazil have also been using girdles like that in aluminum for several decades and it's simply not a problem.


Class III CNC Machinist/Programmer