FF1600 Water Pump & Drives
The "XL" numbers listed for the belts (e.g., 180XL050) are industry standard identification numbers for toothed belts and may be printed on the outside of your old belt.
The 180XL050 belt (#166-01-180) is most common on Formula Ford 1600 engines.
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The 180XL037, 90 tooth, Gilmer drive (toothed belt) is the correct length for most Formula Ford 1600 engine water pump drives with a 30 tooth crankshaft pulley and a 44 tooth water pump pulley.