I played with mine today. I have an O2 sensor, and to get my AFR at idle down to 13, both screws have to be all the way in (lightly seated). So, something is amiss. At ½ turn out, I am at 10.75 AFR.
I changed the needles as I had an extra set, no difference.
Throttle blades are not drilled.
At warm idle, I am at 10.75 - 11 AFR. 15-16" of vacuum, idle at 850 rpm. No off-idle hesitation.
These carbs were restored about 1-½ years ago and the idle circuit was modified for my engine. 455/469
The exhaust is not visibly grey or black and the car runs decent.
Something in the idle circuit is amiss, but hesitant to dig into since the car runs well.
__________________
1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
|