GM Small Block Intake Manifold Gasket Set | Sierra18-0868 Sierra aftermarket marine grade intake gasket set fits GM 305 and 350 cu. in. marine engines from 1995 and older. For GM 5.0L 305 and 5.7L 350 engines from 1995 and older Replaces Mercury 27-17145, 27-72637, FI5000263, FI5000232, and FI1101296 Replaces Chris Craft 16.50-00232 Replaces Marine Power 0007-280 Replaces Volvo Penta 835084, 841032, 3854269 Replaces OMC 985630 and 3854269 Replaces Crusader 21005, RM0243 Replaces Pleasurecraft Marine RM0243 Replaces Mallory 9-61200