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The W72 offered many improvements over the standard L78 400 Pontiac. One of the key upgrades were the 6x4 heads. The standard head seen on an L78 400 Pontiac was the low compression 6x8 head, while the 6x4 head seen on the W72 had hardened valve seats for a higher RPM operating range, improved air flow, and higher compression.
Sometimes confused with the Buick designed and built 215 cu in (3.5 L) aluminum V8 that Pontiac had used in the two years prior, the "Pontiac 215" was an adaptation of Chevrolet's 194 cu.in. inline 6 currently produced and the new 230 cu in (3.8 L) overhead valve Turbo-Thrift straight-6.
The 400 is the only engine that uses a 2.65 in (67.3 mm) main bearing journal and a 2.1 in (53.3 mm) rod bearing journal. The connecting rod was also 400 specific being 5.565 in (141.4 mm) as opposed to the 5.7 in (144.8 mm) rod used in all other small-block Chevrolet engines.
Pontiac's final straight-six engine was the 1966–1969 Pontiac OHC 6 overhead camshaft engine, which was replaced by Chevrolet's straight-six engine and Buick's V6 engine. a The overhead valve Buick Straight-6 petrol engine was introduced in the 1914 Buick Six luxury car and was produced until 1930. Buick did not make another six-cylinder ...
Pontiac Bonneville Sport Convertible F/I 4 bucket seat cnvt (1958) Pontiac Bonneville X-400 (1959–1960) Pontiac Bonneville Le Grande Conchiche (1966) Pontiac Bonneville G/XP (2002) Pontiac Cirrus (1966) Pontiac Club de Mer (1956) Pontiac Fiero Convertible (1984) Pontiac Grand Prix X-400 (1962–1963) Pontiac Grand Prix SJ Edinburgh (1972)
Pages in category "Pontiac engines" The following 8 pages are in this category, out of 8 total. This list may not reflect recent changes. I. Iron Duke engine; O.