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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.
These use a Chrysler custom Torqueflite 904 automatic transmission with an integral Chevrolet bellhousing. 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)
The Super Turbine 300 (abbreviated ST-300) [1] [2] was a two-speed automatic transmission built by General Motors. It was used in various Buick, Oldsmobile, and Pontiac models from 1964-1969. It was the same transmission marketed under different brand names by each division including ST-300 by Buick, Jetaway by Olds and simply Automatic by Pontiac.
The 455 cu in (7.5 L) V8 remained optional but it rated power lowered to 250 hp (190 kW) and was available only with the Turbo Hydra-Matic transmission. The 455 HO engine was discontinued, though GM initially announced the availability of a Super Duty 455 engine (shared with the contemporary Pontiac Trans Am SD455), and several such cars were ...
Pontiac boasted the new system made it easier to load and unload the wagon in tight spaces, but the "Glide-Away" tailgate was prone to electrical and mechanical problems, and water and air leakage problems, as the cars aged. Another trouble-prone feature Pontiacs shared with all GM B- and C-body cars for 1971 was a new power ventilation system.
This transmission, like single and dual range and dual coupling hydramatics, also has the feature of split torque in the transmission, whereby in fourth (or high) gear only 40% to 50% depending on transmission—40% in Roto's case—but because of the design the coupling is only required to carry 40% of the engine torque.
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Technically, a "crate engine" or "crate motor" is any automobile engine that is shipped to the installer in a crate, which can include short or long block configurations. [3] For this article, a crate engine is defined as a fully-assembled engine that includes more than what is typically installed on a long block; the exact configuration will ...