CRANKSHAFT PULLEY SPACERS Use these crank pulley spacers with Ford Racing M-6316-C351/A50/D302 crank dampers to achieve proper belt alignment on past model 5.0L and 5.8L Windsor engines. PART NUMBERENGINEYEARCRANK PULLEY BOLT PATTERNSPACER THICKNESS M-8510-A351 351W1979 & earlier40.350" M-8510-B351 302 351W1980 & later40.950" 0.950" M-8510-C351 302 ? 351W ?1980 & later All40.875" 0.875"
