The outside of their Super Duty engine is cleverly disguised to look exactly like a standard Firebird 455 V-8. That means a massive lump of cast iron, with its water pump the only piece of aluminum in sight. But the source of strength lies not far below its expanse of turquoise paint....
Vintage Pontiac 455 engines feature an intake manifold with a front water crossover passage. The water passage of the manifold is pulled forward to mate to the water pump tube. This sometimes pulls the entire intake manifold too far forw... ...
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they had radically worse performance on paper. The 455 could still pump out a healthy 375 lb-ft of torque (Net), though, so it could get off the line very well.
A list of all the recent improvements includes new seat covers and foam, new heater core, wiper motor, radiator, timing gears, water pump, tires, exhaust and KYB shocks. This Grand Prix is a Model J equipped with a 400 cubic inch V8 engine backed by an automatic transmission. The seller...
Under the hood, the screaming had become a good deal more muted. The Firebird and Firebird Trans Am had been some of the last bastions of genuine muscle car power — the very rare 1973-1974 Super Duty 455 was no less formidable than the meanest of its pre-smog rivals — but by 1976...