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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 ...
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 ...
For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. An evolution of the RA IV and H.O. designs, the SD-455 was a much improved engine. In addition to the more refined cylinder heads, block casting reinforcements in the lifter galley and main bearing oil pan rail area, it had forged connecting ...
This incredibly rare muscle car is an incredibly desirable Pontiac with a powertrain to match.
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.
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A SD-455 equipped engineering prototype Grand Am was built and tested, [4] but was later dismantled and destroyed. 1973 engines may have point or unitized ignition. 1974 engines may have point or unitized ignition or starting around May 1, 1974, HEI ignition. 1975 engines have HEI ignition. 1975 was the first year for the catalytic converter.
Also available was the L77 V code 455 with 270 horsepower (200 kW) available only without air conditioning. Although Pontiac's SD 455 cubic-inch engine lasted one more year with 290 horsepower (220 kW), Oldsmobile's high performance 455 engine would only last one more year culminating with the L76 optioned 455 W-30 Hurst/Olds in 1974.
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