S&S S&S, cast iron valve guide in/ex. +.004″

Description

S&S S&S, cast iron valve guide in/ex. +.004″

36-46 Knucklehead; Knuckles with S&S valve spring covers; S&S KN engines

With a special outer diameter to accommodate S&S KN/ / Flathead Power valve spring covers. Will also fit stock Knuckle and S&S KN engine applications.