Now made of ALUMINUM! 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 100% NEW, high-performance carburetor main body (no re-built components). 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. 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. PROFORM is a registered trademark of Specialty Auto Parts USA, Inc. Holley's and Double Pumper's are registered trademarks of Holley's Performance Products, Inc. This product is supplied by Specialty Auto Parts USA, Inc. and it is not endorsed by any other carburetor manufacturer. Technical Note: Main body does not retain vacuum advance port in original metering block.
Specifications:
| Description_ABR |
Carb Body |
| Description_ASC |
Engine Carburetor Main Body; For Use With Holley #4777 |
| Description_DES |
Engine Carburetor Main Body; For Use With Holley #4777 |
| Description_DEF |
Carburetor Main Body |
| Description_INV |
Carb Main Body; Holley 650 thru 800 CFM |
| Description_EXT |
Engine Carburetor Main Body; For Use With Holley #4777, 4778, 4779 and 4780 Carbs; No Air Horn; Adjustable Air Bleeds and High Performance Down-Leg Boosters; Comes With Gaskets and Jet Kit; Natural Aluminum; 100% New; Sold Individually |
| Description_LAB |
Engine Carburetor Main Body; For Use With Holley #4777 |
| Description_MKT |
Now made of ALUMINUM! 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 100% NEW, high-performance carburetor main body (no re-built components). 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. 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. PROFORM is a registered trademark of Specialty Auto Parts USA, Inc. Holley's and Double Pumper's are registered trademarks of Holley's Performance Products, Inc. This product is supplied by Specialty Auto Parts USA, Inc. and it is not endorsed by any other carburetor manufacturer. Technical Note: Main body does not retain vacuum advance port in original metering block. |
| Description_SHO |
Carburetor Main Body |
| Category |
Carbs |
| Air Bleed Size (Inner High Speed) |
35 / 35 |
| Material |
Aluminum |
| Technical Note |
Main body does not retain vacuum advance port in original metering block. |
| Fuel Bowl Gaskets Included |
Yes |
| Color |
Natural Aluminum Finish |
| Feature/Benefit |
Made of Aluminum |
| Air Bleeds Included |
Yes |
| Primary Main Jet Size |
74 / .078 |
| Main Body Material |
Lightweight Aluminum |
| Air Bleed Size (Outer Idle) |
70 / 70 |
| Needle & Seat |
110 |
| Idle/High Speed Air Bleed Sizes |
73 / 73 |
| Secondary Main Jet Size |
83 / .093 |
| Fuel Bowl Screw Gaskets Included |
Yes |
| CFM |
750 CFM |
| Secondaries |
Mechanical Secondaries |
| Booster Style |
Down-Leg Boosters |
| Air Bleed Material |
Brass |
| Finish |
Natural |
| Fuel |
Gasoline |
| Discharge Nozzle Size (Primary / Secondary) |
.031 in. / .031 in. |
| Length |
5.0000 |
| Width |
9.0000 |
| Height |
14.0000 |
| Weight |
6.0000 |
