Sierra 18-3876 Head Gasket Sierra Head Gasket For GM 305 (5.0L)/350 (5.7L) CID Engine Sierra part number: 18-3876 Interchangeable with the following: Chris-Craft 16.50-00250, Crusader 7057500, GLM 36160, GM 6269577, Mallory 9-63706, Mercruiser 27-75611, 27-75611001, 27-48330, 27-34278, OMC 3853380, 914971, Volvo Penta 841207, 914971, 3853380, 841207-4, 856474-2