[Tom Vaught]

It has been almost a month since I posted last on the Holley Carburetor Info and Tips thread. So today I am going to talk about tyhe Holley List Number #3310 780 cfm carb and how to build one up so you can "JET ONE UP" easily.

1) There are still a LOT of the old Holley 780 Vacuum Secondary List 3310-1, 3310-2, 3310-3 4 barrel carbs out there at the swap meets. There are also a lot of the Chevrolet OEM versions of the same carb at swap meets. They were used on the 396 cid Chevy Engines and will have a Chevy part number along with the Holley #3310 List Number.

The #3310-1, #3310-2 and #3310-3 carbs can still be found at swap meets cheap as Holley made a million of them over the years and are still making a version of the same carb. Assume that you can buy the carb for as little as $15 - $25 for one with all of the pieces. Try to buy TWO #3310 carbs and use one for pieces to build a really good 4 bbl carb. You need at least ONE good Mainbody, at least TWO good Primary Metering Blocks, One good Baseplate and Shafts, and two good Race Bowls for the carb we will assemble.

On the Secondary side of the carb you will see that most #3310 carbs will have a Metering Block on the Primary and a Metering Plate on the Secondary.
(#3310-1 Carbs used TWO Metering Blocks). We are going to try to build a carb like a 3310-1 carb with the TWO Metering Blocks.

So if you skip ahead you went to the swap meets and found the ONE good Mainbody, at least TWO good Primary Metering Blocks, One good Baseplate and Shafts, and two good Race Bowls for the carb we will assemble.

It is very easy once you have the carbs and you remove the rear fuel bowl to determine that you need a "Clutch Tip" screw driver bit to go on your interchangeable bit screwdriver to take the Rear Metering Plate off the carb. So make sure that you have one of those somewhere in your tool box.

So you take the Bowl off and you see that Metering Plate you removed had a #24 Stamp on the plate. What this means is that you need two #72 Metering Jets on the second Primary Metering Block you are going to install on the secondary side.
When you do that you will be able to change jets in all 4 spots without drilling parts (Metering Plates). This is what this post is all about. Building a cheap 780 cfm carb like the #3310-1 carb that had two metering blocks.

In another post I will post up the equivalent Jets for each Metering Plate that Holley offered on their Secondary side of the 3310 type carbs. Time for Lunch

Tom V.