Carb help

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Been there done that. My Holley's worked great on the street for over 25 years without too much trouble until I ran them on a car that had modern brakes (13"/12" discs with hydrabooster) and modern handling (SC&C UCA, 17" wheels, etc). After that my Holley's just flat sucked during low speed hard braking maneuvers. Tried everything the Holley tech guys advised, but nothing totally eliminated the problem.

However, you may as well try to isolate the problem. Disconnect the fuel line to your rear bowl, plug the line and drain the rear bowl. Now drive it and see if you have any change in braking and cornering. If the problems go away, it's your rear bowl. If not, the problem is in your front bowl. All of my problems were due to fuel running from the rear boosters during deceleration.

If you want to see what's happening with your carb, remove it and mount it on four bolts like you're rebuilding it. Place it in a large pan and fill the bowls to spec. Have someone drive you around while you observe your boosters. I found my regular boosters behaved the best, the dog leg boosters lost more fuel and my annular boosters leaked like crazy under even moderate g's.



BTW, I eventually gave up on Holley's for street use due to these reasons. Qjets are simply superior in terms of fuel control during all decel high g's and most accel high g's. Please post if you find a fix for this problem.