I always Loved the ZI engine code and Block, so unique to the build. I had a customer that bought a Rat 1962 Corvette that had an original 1966 ZI 327 / 350 Chevy II engine in it and I was always amazed what GM did to install that in a Chevy II chassis (Recessed oil filter / front sump oil pan, ect) What an Engine! (as one a machinist I used once said: ("Motors are Electric"
Bill