In 1961, Buick unveiled an entirely new small V8 engine with aluminum cylinder heads and cylinder block. Lightweight and powerful, the aluminum V8 also spawned a turbocharged version, (only in the 1962–63 Oldsmobile Cutlass), which together with the turbocharged Corvair Spyder, also introduced in 1962, were the first ever offered in passenger cars. It became the basis of a highly successful cast iron V6 engine, the Fireball. The all-aluminum V8 engine was dropped after the 1963 model year, but was replaced with a very similar cast-iron block, aluminum head version for one year, and then in all-iron versions. Bore spacings for all variants of the SBB are .