Description & Size Guide
3-5/8" big bore. With ''type A'' style gaskets. Includes two of each in .005"; .010"; .015" and .020" thickness. These are specialty copper base gaskets for mechanics that want to achieve a specific compression ratio. Type A gasket explained: Type A'' gasket is the early type introduced on the 1984 Evolution Big Twin models; and can be used on all of the 84-99 Evo Big Twin models and will follow the contoures of the cylinder base perfectly. They will fit 86-22 Evo XL; but stick out at the cylinder base.
84-99 Evo Big Twin with 3-5/8 big bore cylinders (NU)
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