HotCars on MSN
The muscle car engine that was too good for its own good
The Pontiac SD-455 packed forged internals and race-ready heads, but emissions rules forced a cam swap and cost it 20 hp ...
Pontiac nearly put the Super Duty 455 in the 1973 GTO, then insurance and emissions pressure stopped it cold.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results