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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.
Also called the GM small corporate pattern and the S10 pattern. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block compared to front wheel drive installations.
Pontiac also introduced a rare option for the Trans Am GTA in the 1988 model year, the $800 (~$2,061 in 2023) "notchback", which replaced the standard long large, glass-dominated hatchback to make the Firebird design look less like the Camaro design, and shared an appearance with the Pontiac Fiero. The notchback was a special fiberglass rear ...
A new option was Pontiac's D-port 455 cu in (7.5 L) HO engine (different from the round-port offerings of the 1971 and 1972 cars), now that GM had rescinded its earlier ban on intermediates with engines larger than 400 cu in (6.6 L). The 455, a long-stroke engine also available in the full-size Pontiac line as well as the Grand Prix, was ...
The 400 cu in (6.6 L) version was the second, tall-deck "big-block" Olds. Two distinct versions of the 400 CID engine were made: 1965-1967 "Early" 400s used a slightly oversquare 4.000 in (101.60 mm) bore and 3.975 in (100.97 mm) stroke for an overall displacement of 399.6 cu in (6,549 cc). All the pre-1968 engines used a forged steel crankshaft.
Replacing the Pontiac-built OHC six-cylinder as the base engine for Tempest, LeMans, and LeMans Sport was Chevrolet's 250 cubic-inch straight-six engine. V8 offerings included 350 and 400-cid options with 2-barrel carburation and a 330 hp (246 kW) 400-cid 4-barrel carbureted engine with dual exhausts. The four-barrel 350 HO was discontinued.