M8 4.200″ 121CU TOP END KIT .030″ H/G For Harley-Davidson

M8 4.200″ 121CU TOP END KIT .030″ H/G For Harley-Davidson
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M8 4.200″ 121CU TOP END KIT .030″ H/G For Harley-Davidson
Gasket kits include all gaskets, seals and O-rings from the cylinder base thru the rocker cover gaskets. Head and base gaskets are AFM (Aluminum Foam Material), a chemically blown, compounded nitrile synthetic rubber bonded to an aluminium core with temperature resistance of over 250° F (121° C). AFM material has an 85% recovery while maintaining strong torque retention. AFM does not require gasket sealers or re-tightening. Available in stock and Big Bore sizes and various thicknesses to allow engine builders to tune compression ratio.
Replaces OEM: 25700729