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Of those 3,797 cars built in the Judge trim level, only 168 were ordered in the convertible form: RA 400 (147 built), RA IV (18 built), and 455 HO (3 built). The '69/'70 "round-port" RA IV engine, a derivative of the '68½ "round-port" RA II engine, was the most exotic high-performance engine ever offered by PMD and factory-installed in a GTO ...
The SD-455 motor was listed as an option in dealer brochures for the 1973 Grand Am and LeMans GTO(and planned for the Grand Prix as well) although none were produced for sale. Nevertheless, there appears in the October 72 issue of MOTOR TREND, a road test of a 1973 SD-455 Grand Am. 1975 Factory Service Manual lists the SD-455, but the SD-455 ...
While the GTO continued as a big-engined muscle car, the Tempest and LeMans models got a new SOHC 230 cu in (3.8 L) straight-six as the base engine. This engine, as well as the early Tempest with the transaxle in the rear, were ideas of Pontiac's Chief Engineer John DeLorean, who became Pontiac's general manager at the end of the 1965 model ...
The GTO was dropped in 1975, along with the Pontiac 350. The Ventura could be optioned with the Buick 350 V8 instead. The Ventura SJ was a new offering for 1975, when the Ventura and other GM compacts were restyled with new rooflines along with improved suspensions shared with the second generation F platform (Camaro/Firebird), plus standard ...
Both cars would enjoy success and join Chevrolet's Chevelle SS in GM's effort to capitalize on the exploding muscle car era. Engine offerings for the 1965 Tempest were the same as 1964, except the 326 HO was uprated to 285 hp (213 kW; 289 PS) and the GTO 389's uprated to 335 hp (250 kW) and 360 hp (268 kW) via higher rise intake manifolds.
The Pontiac Executive is an automobile model that was produced by Pontiac from 1967 to 1970. [1]The Executive name replaced Pontiac's long running mid-range Star Chief, beginning for 1966 when all Pontiacs in this range were named Star Chief Executive for this one year only, before the series became simply the Executive for 1967.
(There were no convertible Bonnevilles after the 1970 model year.) The rarest of the Grand Ville convertibles was the 1971 model with just under 1,800 examples built. The 1975 model was the most plentiful with just over 4,500 cars built, as being the final year of production increased demand.
Engine selection saw the addition of Pontiac’s largest V8, the 455, available in the L75 325 hp (242 kW) version and the LS5 335 hp (250 kW) HO version. Both the 455 and 455 HO were available as engine options for the Firebird Formula, but the Trans Am received the 455 HO as standard equipment. [23]