Cliff, I am running the Q-jet you prepared for my 68 Firebird 7 years ago. Carb works excellent!!!(7043266)
My question is I replaced the log manifolds with RARE long branch manifolds and a pypes 2.5" dual
exhaust with and X-pipe. Do I need to make any adj since the new exhaust is less restrictive.
Car is actually quieter at cruise speed.
I did adjust idle mixture screws, but honestly I ended up at back at same setting as with original exhaust.
The car seems to run a tad warmer at cruise, but that could be my imagination.
Nothing else has changed and car runs very well, just looking to cover my bases.
68 Firebird 400, Q-jet 7043266, TH400&13" continental converter, 3:08 gears, factory intake and 16 heads.
timing 12 initial, 32 total at 3200 rpm with ported vac adv adding 14 degrees. 180 stat and HD clutch fan 7 blade.
Thanks
Gerry
