Not a slant. 1947 boat Engine
Dad's 2 friends were rebuilding a Continental 226, with parts from a marine engine, that had not been properly winterized, for his big old wooden boat. The engine they were rebuilding had come out of a Kaiser. And, yes, they spent 2 or 3 days trying to figure out why the cam timing wasn't right. The marine engine used gears and the car used a timing chain and they used the car cam with the gears so it turned backwards!