[masraum]

Originally Posted by Norm K

As I recall, the "detuning" of Muscle Cars began with the '71 model year, with 1970 pretty much being the height of horsepower.

_

Yes, '70 was the peak. After that, emissions stuff got added, compression came down, etc.... I think you could still get decent stuff in '71-'72. You can probably do some relatively minor mods to a lot of those to bump things up a bit. I also believe a lot of it had to do with how HP was rated by the manufacturers. I think because of the HP wars, a lot of the ratings were done with no parasitic accessories. I think it's kind of like how most 0-60 times today are done with rollout (I think that's the right term) which means that you get a tiny boost in the 0-60 time.