Quote Originally Posted by dog ear View Post
When smog controls were first introduced in 1968 California based vehicles often ran poorly compared to other parts of the US. California always had tougher emissions laws and the ‘clean air act’ certainly put the kibosh on many highly tuned engine combinations.

Dual four barrels were early victims. Carb calibrations were leaner as well as distributer timing. As we know, certain engine packages were not even available as the 70s wore on. I have a few road tests that were conducted in California and the testers often complained about drivability problems associated with smog equipped engines after 1968.
Yes, just by removing the smog equipment and maybe rejetting the carb (some were tuned to the "lean" side) you could cut the 1/4 mile time by something like one-half second.