This rubber grommet is used on many big block and 6 cyl. engines from 1965 to at least 1989.
Applications (Partial List)
3989347
1.745 GROMMET, Crankcase vent (3/4" I.D. x 1 7/16" O.D.
65-67 Pass. (396, 427)(exc. Sp. H/Per.) (Chevy Parts Books)
66 Chevelle (396)(exc. Sp. H/Per.) (Chevy Parts Books)
67 Chevelle, Camaro (396) (Chevy Parts Books)
70 All (exc. 8 cyl.) (Chevy Parts Books)
70 Nova (396) (Chevy Parts Books)
66 Chevelle w/Sp. H/Per. (396) (Chevy Parts Books)
70 All (400 w/4BC, 454) (Chevy Parts Books)
70 Chevelle, Camaro (396, 400 w/4BC, 454) (Chevy Parts Books)
65-67 Y (396, 427)(EXC. SP. H/Per.) (Corvette Parts Books)
66-67 Y (427) W/SP. H/PER (vent pipe, vent valve) (Corvette Parts Books)
68-69 Y (EXC. 396, 427) (C/Case vent) (Corvette Parts Books)
68-70 Y (427, 454)(vent pipe, vent valve) (Corvette Parts Books)
71-74 Y (454) (Corvette Parts Books)
79-84 C1, 2, 3 (454) (GM Truck Parts Books)
79-84 P3 (454) (GM Truck Parts Books)
81 K3 (454) (GM Truck Parts Books)
85-86 C1, 2, 3 (454W) (C/Case vent) (GM Truck Parts Books)
85 CK1, 2 (305F, H, 350L) (GM Truck Parts Books)
87-89 RV3 (454W) (GM Truck Parts Books)
