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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 ...
A 400 cu in (6.6 L) small-block V8 in a 1975 Avanti II The 400.92 cu in (6,570 cc) 400 is the only engine in this family; it was introduced in 1970 and produced for ten years. It has a 4.125-inch (104.8 mm) bore and a 3.750-inch (95.25 mm) stroke.
The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the 400 cu in (6.6 L) and the 455 cu in (7.5 L) big blocks used a stroke of 4.25 in (108 mm), with crankshaft material changed to cast iron except in a few rare cases.
As Pontiac had discontinued the 455 in the previous model year, a modified 400 Pontiac V8 dubbed the "T/A 6.6" RPO W72 with a single four-barrel 800CFM Rochester Quadrajet carburettor rated at 200 bhp (203 PS; 149 kW) at 3,600 rpm and a maximum torque of 325 lb⋅ft (441 N⋅m) at 2,400 rpm, as opposed to the regular "6.6 Litre" 400 (RPO L78 ...
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