I contacted C&S and they verified that it is 800 cfm. Comes with the HV 301 carb spacer. May need a rebuild kit. IF YOU'RE LOOKING FOR GOOD USED RACE PARTS SAVE ME IN YOU SELLERS AND CHECK OUT MY OTHER AUCTIONS! The item "Holley 2 barrel 800 cfm GAS C&S ump imca dirt late model asa arca 4412 6425" is in sale since Sunday, May 13, 2018.This item is in the category "eBay Motors\Parts & Accessories\Performance & Racing Parts\Auto Performance Parts\Chassis, Suspension & Brakes\Other". The seller is "njc_raceparts" and is located in Northville, Michigan. This item can be shipped to United States.