[Pete Munroe]

My Holley 750 double pumper with center-hung floats has caused the engine to "almost stall on hard braking" since new.

The floats have been up, down, and at the recommended height. The pressure started at 7 psi and now is at ~4.5 psi. The vent whistles were installed by the factory. Purchased about 2003.

On my 327" Corvette I have a smaller, 580cfm/1850 Holley with SIDE-HUNG floats. It has NO problems braking, or cornering.

The 750 center-hung double-pumper has problems braking AND cornering...(stutters/burps in cornering, left or right).

As to the whistles, if stalling on braking is from fuel spilling out of the rear float bowl vent tube under braking how can the fuel move to the REAR of the float bowl...then simultaneously go FORWARD through the whistle and up and out of the vent?

Some off-road Holleys use a tube that connects the front and rear vents and has vent holes drilled in the top center...think it is meant more for the extreme angles of rock-climbing than braking.

Hope someone has the answer, either that IS what a center-hung carb will do or whatever the fix is.