Direct Replacement Components to turn a street carburetor into a high-performance carb: get that extra performance out of your ride in less than 30 minutes! Add up to 25-50 HP with PROFORM's high-performance carburetor main body. Easy swap-in, swap-out installation utilizing existing metering blocks, fuel bowls, and baseplate. Involves only 14 screws. Has adjustable screw-in air bleeds, high-performance down-leg boosters (with new 2-step atomization feature). Get maximum air flow with no air horn, choke tower, or choke control.
Comes with instructions, all necessary non-stick replacement gaskets, and high-performance jet kit. Technical Note: Main body does not retain vacuum advance port in original metering block.
PROFORM is a registered trademark of Specialty Auto Parts USA, Inc. Holley® and Double Pumper® are registered trademarks of Holley Performance Products, Inc. No carburetor products sold under the PROFORM® trademark, including such parts as may fit with or replace a Holley® part number application, are designed, made, or endorsed by Holley Performance Products, Inc. or any other carburetor manufacturer.
Manufacturer | Proform |
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Fitment | Also fits Holley® #4777, 4778, 4779 & 4780 Models |
Color | N/A |
Note | N/A |