I was talking about GMC F models, I know '50's conventionals came with Buick, Olds, Pontiac V-8's.
Ed
Ed, I'm pretty sure GMC never used a Buick engine, but Chevrolet did (the 322 Nail Head) in their 1956-57 Series 9 & 10 trucks/school buses and them in 1958-59 in just the school buses.
Mike B
