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James Gaskets for Cylinder Base: Evolution 3-1/2” Bore

James Gaskets for Cylinder Base: Evolution 3-1/2” Bore

In 1983 the base gasket for the new Evolution cylinders was assigned the part# 16777-83, which was almost immediately replaced by 16777-83A. In 1986 the part# 16774-86 replaced the older 16777-83A gaskets and the part# 16777-83(A) disappeared from Harley litterature. The outline of the 16774-86 gasket underwent several changes during its span of use. But despite of the different outlines any of these gaskets fits a stock Evolution engine from 883 to 1340 cc.

  • for Cylinder base
  • fits Sportster 1986-2008 (exc. XL 1200 N 2007-2008), Big Twin 1984-1998, Softail 1999
  • replaces Harley-Davidson part number 16774-86, and 16777-83

Have any questions?

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