Originally Posted By Cab_Burge
I always ran my race Holley carbs with 9.5 lbs. with the motor idling with both .090 and .100 needles and seats back in the day shruggy
Make sure the fuel level is not high with motor warmed up also scope


That's old hat Cab and the high pressures were to over come the smaller restrictions in the .097-.110 needle n seats............Today, bigger like .120's in 4150's and around 6 psi and .128+ in 4500's with 5 lbs average works great....... thumbs

Last edited by Thumperdart; 09/10/18 02:00 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....