1/8" fuel pump spacer. New fuel pumps are known for creating too much fuel pressure. This spacer gives your fuel pump the proper standoff distance from the fuel pump arm to the camshaft lobe and will lower your fuel pressure. Will fit all years of the 4-134, 6-226, and 6-161 engines, F Head and L Head. Made in the USA. Alternate part number: 639183. Fits:
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