to all 85-92 efi racers

[Ed Wright]

Originally Posted by Mark Yacavone

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.

Those 307" Olds had different secondary metering rods also, no "power step". They all came with the same secondary jets, you only change the rods on that end. Changing the secondary rods and removing that stop really woke that engine up. When I see somebody racing one I think "I'll bet it has the wrong carb". Should be illegal to do that unless they factor it hard enough. Like turning up the boost.

Sorry, just had to say that. :-)