I need some carb help!!!

[73MACH]

Ok, I have a couple of issues I'm trying to figure out. I have a new Holley 750cfm 4160 carb on top of my 351 cleveland 2v in the '73 mach 1.

Problems are as follows.....
1. Secondaries are not opening

2. Sometimes there is a severe hesitation. If you slowly get on the throttle from a stoplight, it hesitates the worst. If you get on the gas decently, it's not anywhere near as bad and quickly regains the power, but it's still there.

How do I determine which accelerator cam or accelerator pump nozzle I would need?

Any advise to get me going in the correct direction is greatly appreciated!!

[Russ Jerome]

Hesitation:

Holley's 4160 series carburetors are very similar to the 4150, but the 4160s are all vacuum secondary units, and do not have provisions for an accelerator pump circuit for the secondary barrels. The secondary side is fitted with a fixed-jet metering plate, rather than the metering block with interchangeable jets found on the 4150.

[DR.FORD]

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[Smokey1226]

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^^ Did a guy call you named Lee? He asked for the best, so i gave him the best ;)