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The 421.19 cu in (6.9 L) was introduced in 1961 as a dealer-installed Super Duty option for racing. 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.
The Pontiac Fiero is a ... This inlet scoop fed the 2.7 L (165 cu in) Super Duty engine which was only exclusive to the actual Pace Cars. The Super Duty engine was ...
The first car was a red 1977 Firebird Trans Am survivor car from the Restore a Muscle Car Collection with a price of $57,200 (~$224,521 in 2023). The second vehicle was a rare 1974 Pontiac Trans AM 455 Super Duty, which was another survivor that reached $100,000 (~$480,810 in 2023) plus 10% buyer commission.
The Iron Duke engine (also called 151, 2500, Pontiac 2.5, and Tech IV) is a 151 cu in (2.5 L) straight-4 piston engine built by the Pontiac Motor Division of General Motors from 1977 until 1993. Originally developed as Pontiac's new economy car engine, it was used in a wide variety of vehicles across GM's lineup in the 1980s as well as supplied ...
The base 455 produced 40 fewer horsepower than the round port Super Duty 455. Horsepower for the base L75 455 was rated at 250 at 4,000 rpm and 370 lb/ft at 2,800 rpm. Pontiac removed the H.O. designation from the base engine, and simply decaled the now non-functioning shaker with "455".
This was the first in a series of NASCAR-ready pre- Super-Duty V8 engines and introduced the long line of multi-carburetor-equipped engines that saw Pontiac become a major player during the muscle car and pony car era of the 1960s. The enlarged 1956 Pontiac V8 found its way into light-duty GMC pickup trucks.