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Old 07-19-2009, 12:38 AM
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Originally Posted by gbowne1
I'm looking for info on the Holley 750 Double Pumper carburetors. I'm changing from a Rochester Qjet setup.

Specifically the 3310, 4150, 4160, and 4779.
Why you would change from the best all around carb ever made is beyond me.

That said, a Holley carb can be a 4150 (w/secondary metering BLOCK) or 4160 (w/secondary metering PLATE).

A 3310 is a vacuum 2'ndary carb, the 3310-1 was a 4150, all the rest have been 4160's.
The 4779 is a 750 double pumper, and is a 4150.

If you're using this car for daily transpo, and have a mild cam, Performer intake, street gears and converter, forget the 3310.

Use a smaller vacuum 2'ndary carb- like the 1850 600 CFM vacuum 2'ndary 4160 carb. It's all the engine will likely ever need, unless you race it or for some reason run it to very high RPM's. It'll have better response and fuel mileage than the 750, due to the smaller primaries.
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