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The "all hand-assembled" LS2 SD455 engine was rated at 290 hp (216 kW) at 4000 rpm and 395 lb⋅ft (536 N⋅m) at 3600 rpm. All Pontiac engines included a new EGR system, which delayed the SD-455 program until late into the production year. The shaker decal on the scoop read "SD-455". The 1973 Trans Am introduced "Radial Tuned Suspension".
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 ...
The SD 455 was available for one more year in the Trans Am. As emissions regulations were increasing, two of the three iterations of the 455 cu in (7.5 L) engine were discontinued after 1974, with the final version of the 455 remaining available through 1976.
The 1974 models featured a redesigned "shovel-nose" front end and new wide "slotted" taillights. The 400, 455, and SD-455 engines were offered in the Trans Am and Formula models during 1974. A June 1974 test of a newly delivered, privately owned SD-455 Trans Am appeared in Super Stock and Drag Illustrated. With an unmodified car and a test ...
1973–1975 L65 400 cu in (6.6 L) V8 with 2-barrel carburetor (standard engine, others were optional) 1973–1975 L78 400 cu in (6.6 L) V8 with 4-barrel carburetor; 1973–1975 L75 455 cu in (7.5 L) V8 with 4-barrel carburetor; Notes: A SD-455 equipped engineering prototype Grand Am was built and tested, [4] but was later dismantled and destroyed.
The 455 V8 was discontinued for all LeMans models for 1975, but was still available in the Grand Am. Transmission offerings included a three-speed manual standard with the six-cylinder and 350 two-barrel V8, with the three-speed Turbo Hydra-matic optional with those engines, a "mandatory" option with all other engines in sedans and coupes, and ...
One feature of the Can Am was the Trans Am's shaker hood scoop as standard equipment, and succeeded the slow selling 1973-1975 Pontiac Grand Am. [ 1 ] [ 2 ] The car was a trim package of the Pontiac Le Mans, but powered by the Pontiac 400 rated at 200 hp (149 kW; 203 PS) (the T/A 6.6 "W72" version, not the base 400, which made 180).
The new version of the Trans Am Pontiac's "RPO Y84" Black and Gold Trans Am S/E, made famous by Burt Reynolds and Jackie Gleason in 1977's "Smokey and the Bandit", carried on into 1982 as the RPO Y82/Y84 Limited Edition Trans Am S/E Recaro Edition" aka "Recaro T/A". The package added about 25% to the price of a Trans Am. Standard with a host of ...