As i recall, Tom Langdon had a McGurk roller cam in the GMC that powered his '39 Chevrolet. One might ask him about sources for a roller cam and lifters. Tom would be someone who might engineer the lifters.
Bob Garrett has a couple of Chet Herbert roller cams, and he might have one for a GMC, but i don't know that he'd part with it.
God's Peace to you.
d
Inliner #1450
