Originally Posted by GY3
750 Holley 3310. They come with 72 jets in the primary which is about perfect. Put the softest spring in the secondaries and you are golden. I've always used this on mild 440's, had great drivability, power and even mileage.

Holley has made the 3310 from way back, not all of them have the same jets, air bleeds and or a rear metering plate or metering block.
My message is the List 3310-1 versus 3310-7 may or will have different primary jet #s scope

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)