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The 421.19 cu in (6.9 L) was introduced in 1961 as a dealer-installed Super Duty option. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. The first of the "big journal" Pontiac V8s, it had a bore and stroke of 4 + 3 ⁄ 32 in × 4 in (104.0 mm × 101.6 mm) and came with dual four-barrel carburetors.
A 2.7-liter, 232 hp (173 kW) Super Duty engine powered the 1984 Fiero Indy Pace Car to over 138 mph (222 km/h) during the race, but Super Duty engines were never available in factory-built GM vehicles. However, GM sold the Super-Duty-specific parts at authorized dealers and all of the parts required to convert a stock Iron Duke engine to a ...
One holdout to this industry-wide slide was the Super Duty 455 engine of 1973–1974. Available only in the Firebird Formula and Trans Am models, this was rated at 310 hp (230 kW) net initially but after having issues passing EPA emissions tests, the camshaft was changed to the old RA III cam, and with the change, came a 290 hp (220 kW) net rating.
The Oldsmobile engine was very similar to the Buick engine, but not identical: it had larger wedge combustion chambers with flat-topped (rather than domed) pistons, six bolts rather than five per cylinder head, and slightly larger intake valves; the valves were actuated by shaft-mounted rocker arms like the Buick and Pontiac versions, but the ...
The base 455 produced 40 fewer horsepower than the round port Super Duty 455. Horsepower for the base L75 455 was rated at 250 hp (186 kW) at 4000 rpm and 370 lb⋅ft (502 N⋅m) at 2800 rpm. Pontiac removed the H.O. designation from the base engine, and simply decaled the now non-functioning shaker with "455".
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