What are the bore and stroke specs for a Pontiac 400 CID Y block?
The Pontiac 400 CID engine is not a Y-block engine. The Pontiac Y-block engines were produced from 1955 to 1956 and had a displacement of 287 to 316 CID. The Pontiac 400 CID engine was produced from 1967 to 1979 and had a bore of 4.120 inches and a stroke of 3.750 inches.