3310 Holley Carbs
 

A friend of mine has a bunch of Holley carbs and parts. I can run a 780 on my stocker. Is there any list numbers or metering plate numbers that are better or more desired. He has a GM replacement carb also that is a 780. Any recommendation or suggestions are welcome.

Kirk

Re: 3310 Holley Carbs
 

A 3310 is a 750.

Re: 3310 Holley Carbs
 

early ones were designated 780

Re: 3310 Holley Carbs
 

Engine tech spec gives throttle bore measurements, use that to check the carb. If it matches you can use the carb.

Re: 3310 Holley Carbs
 

Either buy a Quick Fuel, or call Clark Holroyd, or Jimmy Bridges, tell them what you have, and send them what they tell you they want. You'll be time and money ahead.

Re: 3310 Holley Carbs
 

On my flow bench an old 3310 flowed 788 CFM, an old 4780 flowed 780. I still have a few old 3310s, I bought about 8 of them from a friend back in the early 70s, Paul.

Re: 3310 Holley Carbs
 

I thought the 3310 with a "metering plate" was a 750 and a 3310 with a "metering block" with replaceable jets was a 780.

Anyone?

Re: 3310 Holley Carbs
 

Difference is in the boosters. 780s have drop down boosters, 750s have straight boosters.

Re: 3310 Holley Carbs
 

Also, the 3310 & 3310-1 have the replaceable secondary jet blocks and are rated at 780, the later (& cheaper versions) 3310-2,3,4 etc use the secondary metering plate and 750 rating. I believe that the later 750 versions also use the Holley manual choke setup, while the 3310 &-1`s that I have owned, always had an automatic choke. Also some of the later carbs used cheap plastic accelerator pump arms, secondary diagpram housings, and manual choke units.

Re: 3310 Holley Carbs
 

And if your spec allows a 3310 then you can replace the rear boosters to the drop down for a +30 CFM gain and you can also replace the metering plate with a metering block for easier tuning.