Originally posted by Marlin Jack:
...I would like to make just one correction to the Above Post:
The Holley '650' CFM is a 'Double Pumper' Having Mechanical Secondaries.
The Demon p.n. 1282020VE is a carburetor exactly as I described.
a "street performance" tuned 650 cfm Holley style carburetor, annular boosters, vacuum secondaries, electric choke.
It has been discontinued, but can still be found for sale on eBay, Amazon, etc.
Quick Fuel also sells vacuum secondary carburetors rated 680 cfm such as the SS-680-VS, but they lack the annular booster venturis. Do you think Quick Fuel would special order one with the annular boosters from the SS-650-AN double pumper?
By the way, Quick Fuel and Demon are both Holley companies now.
The "other" small four barrel carb with annular boosters is the Summit Racing p.n. M08600VS, which is indeed rated 600 cfm.