ROCKER GASKET,1956-62 650 (Alloy Head)

This is the rocker box gasket for the pre-unit 650 twins running the alloy head, covering the 1956-62 span per the catalog listing. It seals the rocker box cover to the head casting, keeping oil where it belongs instead of weeping out around the cover edge. The older alias number for this part is 1287, so if you're working from an earlier parts book that's the same gasket by a different name. Pre-unit rocker gaskets like this are a common wear item since the cover gets pulled for valve adjustment work, and a tired or hardened one is a frequent source of oil seepage at the top of the motor. Worth having a fresh one on hand any time you're into the rocker box.