Weiand Supercharger Drive Belt - 3'' Wide

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To find the correct length drive belt for your 671 or 871 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. | Part No. | Small-Block Chevy | Big-Block Chevy, Std. Deck | Big-Block Chevy, Tall Deck (1) | Chrysler 392 Hemi | Belt Length | | 925-7006 | 64 to 70 | - | - | - | 54.0'' | | 925-7007 | 70 to 78 | 64 to 66 | - | 65 to 69 | 56.0'' | | 925-7008 | 74 to 78 | 64 to 70 | - | 69 to 73 | 57.0'' | | 925-7013 | - | 68 to 77 | 64 to 69 | 75 to 78 | 58.5'' |
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