Description & Size Guide
3-5/8" big bore. Front & rear gasket set. Type ''A'' gasket. .020" thick RCS (Rubber Coated Steel). Gasket with an embossed steel core with a .001" thick coating of heat resistant nitrile rubber on both sides. OEM replacement reference none. Note: Type A'' gasket explained: Type A'' was introduced on the 1984 Evolution Big Twin models; and can be used on all of the 84-99 1340cc Evo models and will follow the contours of the cylinder base perfectly. They will fit 86-22 Evo XL; but stick out at the cylinder base. This can be a problem with silicone beaded base gaskets. Both type ''A'' and type ''B'' have identical inner bore diameter; oil hole and stud hole locations. Gaskets for front & rear cylinder are identical. Only difference between the ''A'' & ''B'' gaskets is the outside perimeter.
84-99 Evo Big Twin; 86-22 XL Sportster. With 3-5/8" big bore cylinders (NU)
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