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The Grand Prix is a line of automobiles produced by the Pontiac Division of General Motors from 1962 until 2002 as coupes and from 1989 through 2008 model years as four-door sedans. First introduced as a full-size performance coupe for the 1962 model year, the model repeatedly varied in size, luxury, and performance over successive generations.
The 1970 '455 HO' was a conventional "D" port engine. It was rated at 360 hp at 4300 rpm in the GTO and 370 at 4600 rpm in the Grand Prix and other full-size Pontiacs. Ram Air induction was optional in the GTO, though power ratings were unchanged.
1970 GM Y platform, GM A platform: 3 Compact (1960–1962), mid-size (1963–1970) Ventura: 1960 1977 GM B platform GM X platform: 2 Full-size, later compact Grand Prix: 1962 2008 GM H platform (RWD) 1 Personal luxury car (1962–1987), full-size car (1996–2008), mid-size car (1988–1996, 1996–2002 coupe) LeMans: 1962 1993 GM Y platform GM ...
The G-body designation was originally used for the 1969–1972 Pontiac Grand Prix and 1970–1972 Chevrolet Monte Carlo personal luxury cars, which rode on longer wheelbases than A-body coupes. For 1973, the Grand Prix and Monte Carlo were related to the A-body line, with all formal-roof A-body coupes designated as A-Special (and, after 1982, G ...
The Pontiac brochure indicated the same 455 installed in the Grand Prix model was rated at 370 hp (280 kW). The camshafts used in the "Ram Air" 400 and the GTO 455 HO were the same. For example, manual transmission 455 HOs used the same 288/302 duration cam as the "Ram Air" 400. The 455 was rated at 360 hp (270 kW) at 4,300 rpm.
The Ventura SJ was marketed as an American rendition of a Euro-style luxury sport sedan that Pontiac created with the larger mid-sized Grand Prix in 1973, as well as a competitor to the new-for-1975 Ford Granada and Mercury Monarch, both marketed as luxury compacts designed to compete with the more expensive imports such as Audi and Mercedes ...
This engine was used in the 1970 AMX as the base engine and also in the 1970 Rebel, the 1971 through 1978 Matador, Jeep J-series trucks from 1970 until 1987, Wagoneer (SJ) models from 1972 until 1984, Cherokee (SJ) from 1974 until 1983, as well as in the full-sized Grand Wagoneer from 1984 through 1991 - becoming one of the last carbureted ...
Also using a variation of the A-body chassis and suspension were the 1969–1972 Pontiac Grand Prix and 1970–1972 Chevrolet Monte Carlo — both of which were marketed as intermediate-sized personal luxury cars and coded as G-body cars. The Grand Prix had a 118 in (300 cm) wheelbase and the Monte Carlo had a 116 in (290 cm) wheelbase.