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After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400 cu in (6.6 L). Pontiac still offered the regular 455 (RPO L75) in its full sized cars, and after a negative public reaction for dropping the 455 engine, it was re-introduced mid-year as an available option for the 1975 Pontiac Trans Am.
Pontiac made the 301 (4.9 L) V8 available for order in the lower Firebird models, but due to such high demand and popularity, they removed its availability from the Firebird model to allow enough 301 engines for the other Pontiac lines. It was re-introduced as an option in 1979 as production for the 400 ceased and tooling was converted over to ...
In mid-March 1971, a second design change for the GT-37 switched the striping to a reflective sword-style stripe sometimes referred to as the 1971 ½ GT-37. 1971 also afforded the customer the opportunity to choose any of Pontiac's optional V8s such as 350, 400, or 455 cubic inch models, including the 455 High Output (HO) engine. The 455 had ...
The '69/'70 "round-port" RA IV engine, a derivative of the '68½ "round-port" RA II engine, was the most exotic high-performance engine ever offered by PMD and factory-installed in a GTO or Firebird. The 1969 version had a slight advantage as the compression ratio was still at 10.75:1 as opposed to 10.5:1 in 1970.
Do not confuse with later AMC 2.5 L engine that uses GM small corporate pattern . Chevrolet Turbo-Thrift engine (post-1962) Chevrolet 153 Inline 4 (Chevy II, pre-Iron-Duke - includes the Vortec 3000/181 industrial/marine crate motor) Detroit Diesel V8 6.2L and 6.5L; Duramax V8; Generation III V8s with modifications. These modifications include ...
From their inception in the 1950s until the early 1970s, Pontiac engines were known for their performance. The 455 cu in (7.5 L) V8 was the largest and available in most Pontiacs except in the compact-size cars. At the height of the horsepower era, Pontiac engines reached ratings of 390 hp (291 kW; 395 PS) (SAE gross), though other engines ...
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