Holley model 4160, series 3310 carbs

[patrickt]

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.

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.