The information for the GMC engines is scattered.The oldest book I have that mentions them is "How to Hop Up Chevrolet & GMC 6 Cylinder Engines" from1951 by Floyd Clymer. Next are Clymer's 1954 "Chevrolet Speed Manual" And California Bill Fisher's reprint of it in 1995. Both have sections on GMV & Buick engnes but certainly not much. The newest I have is Fisher's "GMC Speed Manual" from 1955.
Although there is a lot of information in these books it is old and a lot of the parts mentioned are no longer available. Many of the valves, springs, and ignitions available today were not around then. If there was ever a market ready for a new book this is it. Some new technology can be applied to these old motors. Sadly we are losing guys that know things that have never been written down or shared. I am not familiar with the military 302.
