V-Twin Mfg. GB Silicone Rocker Gasket Set For Harley Silicone Panhead rocker gaskets seal uneven surfaces and withstand temperatures up to 400 F. Features: Black silicone is 1/8 thick For installation wash the cover and engine flange with solvent Surfaces must be dry, no oil or lube of any type Use the lock washers or thread lock and torque (one time): 20 to 25 inch pounds. Do not overtighten Replaces OEM 17541-48 B