The 3310 is a 750 cfm carb. They are great. I have been using that carb on any motor from 350 to 440 c.i. since anout 1973, and they seem to run good on everything with very little tuning required. I just put one on my 340 and it is fantastic. This carb was originally made for G.M. and they put it on the 1965 Z-16 396 engines. Here's a quote from a Rod Authority article: "In 1965, the new list number 3310 (a model 4150 carb), made its smash debut on the 375-horsepower 396ci engine that came in the 1965 Z-16 Chevelle. It only lasted for one year as an OE production carburetor, but it had been such a huge success as a performance carburetor that Holley released it as an aftermarket carburetor in 1966, available to the masses.
The 3310 started out as a 4150 model with primary and secondary metering blocks and in the 1970s, Holley changed it to a 4160 model with a secondary metering plate. Since the 4160s introduction, it has been one of Holleys best selling carburetors and has been listed in Hot Rod Magazines Hot Rod Speed Parts Hall of Fame as one of top 10 speed parts ever produced that have had a significant impact on hot rodding as we know it."
