Quote:
Originally Posted by dcdoug
Does anyone know what the differences are between the litany of series of Holley 4160, 3310 carbs? Holley's site isn't that helpful.
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The Holley 4150 and 4160 are essentially the same, except the 4160 has no secondary metering block. If you take a 4160 and buy the kit to add a secondary metering block you have essentially turned it in to a 4150. If I recall correctly, it was about 1966 when the car manufacturers stopped using the 3310 as original equipment. When you bought the carb from Holley it was still referred to as a 4150 carburetor and it was 780 cfm. It had a "dash one" after the part number 3310 on the air horn and it had a secondary metering block (ID number was 7003, I think). Then about a decade later the 3310 model 4150 morphed into the 3310 model 4160 with a secondary metering plate and a 750 cfm rating. Every time Holley would make a teen weeny tweak to it they would up the dash number. Somewhere I have a description of what the tweaks were, but they're generally not as much as you would think, and 3310-11 is the current model.