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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.
The shakers had a "6.6 Litre" decal for all L78 Pontiac 400 and L80 Oldsmobile 403 engines. Only the optional W72 Pontiac 400 received the "T/A 6.6" decal. [39] As Pontiac had discontinued the 455 in the previous model year, a modified 400 Pontiac V8 dubbed the "T/A 6.6" with the RPO W72 became available as a pay-extra upgrade to the standard ...
1973–1975 L65 400 cu in (6.6 L) V8 with 2-barrel carburetor (standard engine, others were optional) 1973–1975 L78 400 cu in (6.6 L) V8 with 4-barrel carburetor; 1973–1975 L75 455 cu in (7.5 L) V8 with 4-barrel carburetor; Notes: A SD-455 equipped engineering prototype Grand Am was built and tested, [4] but was later dismantled and destroyed.
In place of the previous 400 and 455 cubic-inch V8s, 301 and 403 cubic-inch V8s were fitted to the model line; a 350 cubic-inch V8 was also added as an option. [ 20 ] For 1979, the Grand Safari was renamed the Bonneville Safari (marking the return of the combined nameplate for the first time since 1965).
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