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Often called the "Ram Air III", this engine was officially called the "400 Ram Air" for 1969 and then simply "Ram Air" for the 1970 model year. It would later become known colloquially as the "Ram Air III", though Pontiac never called it by that name. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula.
There was an additional Ram Air IV option for the 400 cu in (6.6 L) V8 engines during 1969, complementing the Ram Air 400(now often colloquially but incorrectly called the "Ram Air III," a name never used by Pontiac). The Ram Air IV was rated at 345 hp (350 PS; 257 kW) at 5000 rpm and 430 lb⋅ft (583 N⋅m) of torque at 3400 rpm; [11] and 335 ...
There were two Ram Air 400 cu in (6.6 L) engines available for the 1970 Trans Am: the 335 hp (250 kW) L74 Ram Air III 400 (366 hp (273 kW) in the GTO) and the 345 hp (257 kW) L67 Ram Air IV (370 hp (280 kW) in the GTO) that were carried over from 1969. The Ram Air IV was exclusive to the Trans Am, and could not be ordered on any of the lower ...
Although originally conceived as a 303 cu in (5.0 L) model to compete in the Trans Am racing series, in a cost-saving move the Pontiac Trans Am debuted with the standard 400 cu in (6.6 L) engines. This year also saw DeLorean leaving the post of general manager to accept a similar position at GM's Chevrolet division.
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.
The ten horsepower increase over 1968's engines was due to a different cam and the use of the #48 big valve heads, the same head used on the Ram Air 3 400-cubic inch 366 hp (273 kW) engine and the 428-HO engine at 390 hp (291 kW). The 1969 model year would be the last high-performance version of the Pontiac 350.
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For example, even with the modifications to reduce emissions and increase efficiency, AMC's 401 cu in (6.6 L) engine was among the strongest factory-spec engines available in an American car in 1971, with more horsepower than Pontiac's standard 455 cu in (7.5 L) and Chevrolet's 454 cu in (7.4 L) that powered the Corvette.