S&S, KN421 CAMSHAFT. .420" LIFT

S&S, KN421 camshaft. .420" lift

.420" valve lift. Designed for large displacement engines up to 103". With the identical .420" valve lift as the KN420, but with longer duration. High lift valve springs required.

Fits: > 36-47 74" Knucklehead; S&S KN-series engines