Quote:
Originally Posted by Ed Wright
I used to make my living building Quadrajets, and as I remember the only versions with the stop on the top secondary air valves were the 307" Olds.
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I hope I don't get some of my friends all torqued off by bringing this up.
The 68 Firebirds had a restricted secondary carburetor from the factory. I seem to remember it wasn't the air valve but something on the secondary butterfly linkage.
It seems that there was an edict issued by Pontiac management that no car could have under 10 lbs per hp, so at about 3300 lbs, the Firebirds all had to rated at less hp than the GTOs that were using the same motors. So Pontiac just lowered the ratings and restricted the carbs. That system didn't last long,once the racers realized it was there, as you can imagine.
Doesn't matter now anyway,because you can use a 207 Chevy carb.