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Pontiac offered this to the public as a streetable version of the 421 SD. The engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. #9770716 aka "716" heads featured a 170cc intake ...
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.
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.
These six coupes and six station wagon variants, with their 421 cu in (6.9 L) Pontiac Catalina engines, transmissions and rear ends replacing the Tempest's 326 cu in (5.3 L) engine, rear-mounted Corvair-based transaxle and the small diameter drive shaft often referred to as a "rope" were described as "beyond fast".
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.
Vanna White's son, Nikko, generated a viral moment in the kitchen with his mom after fans declared him to be "handsome," and desperately wanted to know more.
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