I posted about it in 2017, https://justacarguy.blogspot.com/2017/01/one-of-things-that-made-usa-cool-place.html
I think that's pretty cool
and really, a Hemi Coronet! There were only 105 made by the factory, the A990 cars
The NHRA was fed up with the nagging by the losers, so, it told Chrysler "No fiberglass, no aluminum"
So Chrysler says ‘no problem,’ and simply stamped new sheet metal out of super-thin steel, changed the heads to aluminum and built the intakes out of magnesium.
Result: the new A990 cars weighed the same as previous year’s S/S cars!
The A990 Coronet was one of the bare-bones designs whose execution was heralded as Chrysler engineer Jim Thornton’s finest achievement.
Thornton figured out ways around the rules; beyond body lightening, the wheelbases were lightly massaged, a hood scoop was added, and the battery was moved into the trunk
The name A990 was the motor’s engineering code, used this single year and denoting the magnesium intake, special aluminum cylinder heads and special factory-authorized tubular exhaust headers, many of which were never offered again on a factory Super Stock package.
The cross-ram with dual Holley 4-barrel carburetors was designed specifically for sonic tuning, a factor that allowed versions of this engine to win NHRA Championships in 1965 and 1967.
https://www.mopar-forum.eu/viewtopic.php?f=22&t=9064&start=3760#p951851
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