holley carbs

Good explaination.

When you look at a double pumper, for the most part, you can see a picture of them at Summit racing, they look like a naked carb, nothing really on them. Just linkage on the drivers side, fuel lines on the passenger side. No round tilted dash pot for the secondary operation.

The twin squirters are seen looking into it, but the pumps can be seen from the outside of the carb, down low, underneath at the corner on the fuel bowls.

That is it for Holleys.

Note that all Carters are mechanical in secondary operation. There secondarys can be held back from opening when it is to cold. Choke linkage disables there operation. But once warmed up, they'll open like a Holley double pumper. The air door above them, weighted or spring loaded is not so much a vacuum operation as it is more of a air velocity operation. And thats what puts the Carters into a vacuum operation type catogory. (Humm sp?)

It's the same idea working on a different angle. You can make a Carter operate ethier way. It just takes work to do it.