Firebird production only. 301:Naturally Aspirated 1977-1981 Pontiac Bonneville 1977-1981 Pontiac Catalina 1977-1981 Pontiac Firebird 1977-1981 Pontiac Grand Prix 1977-1981 Pontiac LeMans 1977-1981 Pontiac Parisienne 1978-1980 Pontiac Grand Am 1978-1981 Buick Century / Regal / LeSabre 301:Turbo 1980-1981 Pontiac Firebird Formula / Trans Am 265 Based on the same short-deck as the 301, the "LS5" was offered only in 1980 and 1981. It could only be ordered with a TH200 automatic transmission and a 2bbl configuration. It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. It featured a smaller bore of coupled with the same stroke of the 301 (same bore and stroke used by Chevrolet when the first small block motor was introduced in 1955). It produced After 1981, the Pontiac V8 was replaced entirely by the GM "corporate" V8's from Chevrolet and Oldsmobile. Applications: 1980-1981 Pontiac Bonneville 1980-1981 Pontiac Catalina 1980-1981 Pontiac Firebird 1980-1981 Pontiac Grand Prix 1980-1981 Pontiac LeMans 1980-1981 Pontiac Parisienne 1980-1981 Buick Century 1980-1981 Buick Regal 1980 Oldsmobile 88 Large-journal engines:1961-1976 421 The was introduced in 1961 as a dealer-installed Super Duty option. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. The first of the "big journal" Pontiac V8s, it had a bore and stroke of and came with dual four-barrel carburetors. It featured main journals (which the legendary Smokey Yunick reputedly left Pontiac's engineering department over). The 421 SD became factory installed in 1962 and in 1963 a street version became available from the factory with a dual four-barrel or three two-barrel Tri-Power carburetion. Modified versions of this engine were extensively used in NASCAR stock car racing and drag racing competition. The premier SD 421 cylinder head was the late 1962-early 1963 casting #9771980 aka "980", featuring a larger intake port volume, flowing @ . The 421 also marked the end of the option for a forged-steel crankshaft. The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. "Armasteel" was a trademark of pearlitic malleable iron developed by GM's Saginaw Metal Casting Operations around 1936, which was referred to as "locking ball" cast-iron, as opposed to the "flaking" type found in other engines. In 1967, Pontiac moved on to a technologically simpler nodular cast iron (invented in late 1940s) crankshaft, which they used until 1975. 428 In 1967 the