To find the correct length drive belt for your 6-71 or 8-71 supercharger, do the following: Add the number of teeth on your top and bottom pulley. Look in the belt chart below in the column under the engine you are using and find the number that equals the total teeth on your pulleys, then read to the left for the proper belt part number.
| Supercharger Belt Application Chart | ||||||
| Part No. | Pitch | Small-Block Chevy | Big-Block Chevy, Std. Deck | Big-Block Chevy, Tall Deck (1) | Chrysler 392 Hemi | Belt Length |
| 925-7006 | 1/2" | 64 to 70 | - | - | - | 54.0'' |
| 925-7007 | 1/2" | 70 to 78 | 64 to 66 | - | 65 to 69 | 56.0'' |
| 925-7008 | 1/2" | 74 to 78 | 64 to 70 | - | 69 to 73 | 57.0'' |
| 925-7013 | 1/2" | - | 68 to 77 | 64 to 69 | 75 to 78 | 58.5'' |
| 925-7009 | 1/2" | - | 75 to 78 | - | - | 60.0'' |
| 925-7100 | 8mm | 108 to 124 | 105 to 116 | - | - | 56.7'' |
| *XX to XX = Min to Max Pulley Tooth Count | ||||||
(1) The belts listed are for WEIAND supercharger kits installed on a Chevrolet Big-Block tall deck with either a Weiand #8204 or #8206 manifold spacer kit or Weiand's new manifold #7152 (satin) or #7152P (polished).
(2) 1/2'' pitch measurement is taken from center of one tooth to center of next.
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.