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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 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 ...
A 363 hp (271 kW) engine was offered to drag racers. Late in the 1961 sales season the 421 cu in (6.9 L) Super Duty was released for sale as a dealer installed engine. The 1961 models never came from the assembly line with the 421ci engine; instead it was a specialty item installed and sold at the discretion of individual dealers.
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.
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.
For 1962, Pontiac offered a 421 cu in (7 L) Super Duty V8 with two four-barrel carburetors, rated at 405 hp (302 kW), as a US$2,250 option as the base Star Chief listed at US$3,097 ($31,195 in 2023 dollars [5]). [10] A rare option, it was probably never ordered on this somewhat heavy sedan.
The Trophy 4 engine is a short-stroke, 45-degree inclined [4] inline four created from the right bank of the 389 V8 for the debut of the Tempest in 1961. Its 194.43 cu in (3.2 L) displacement is precisely half of the 389, with an identical bore and stroke of 4 + 1 ⁄ 16 in × 3 + 3 ⁄ 4 in (103.2 mm × 95.3 mm).
For 1963 only, Pontiac offered the 421 cu in (6.9 L) Super Duty with two four-barrel carburetors, rated at 425 hp (317 kW), as a US$2,250 option ($22,104 in 2023 dollars [5]) whereas the base Bonneville was listed at US$3,349 ($33,330 in 2023 dollars [5]). [14] 1963 Pontiac Bonneville sport coupe