49 51 Pass 3740662 1 VENTILATOR ASSY crimped top 58 62 Pass 6 cyl exc pos vent closed vent 3743070 1 VENTILATOR ASSY NOTE 1 Contains parts and instructions for complete installation 50 62 Pass 6 cyl 5645937 1 KIT positive vent CV 3 56 62 Pass w 2BC 265 283 62 Pass 327 6421987 1 KIT positive vent CV 1 56 61 Pass w 4BC 2BC 8 cyl 6421988 1 KIT positive ventilation CV 2 55 60 Pass 6 cyl 6419925 1 KIT closed vent adapter KV 1002 use w 5645937 55 Pass w 2BC KIT closed vent adapter KV 1003 56 57 Pass w 4BC use w 5646314 56 60 Pass w 2BC 265 283 58 60 Pass w 4 BC 6419926 1 use w 5646034 61 Pass w closed vent 8 cyl 62 Pass w closed vent 283 6421785 1 VALVE ventilator metering 61 62 Pass w pos vent closed vent 6 cyl 6421787 1 VALVE ASSY metering CV 208 62 Pass w closed vent 8 cyl exc 283 63 64 Pass 8 cyl 6421934 1 VALVE ASSY vent CV 590 63 Pass 230 64 Pass 230 exc closed pos vent H D A CL 6421971 1 VALVE ASSY vent CV 609C 56 61 Pass closed vent w 4BC 5646262 1 ADAPTER carburetor CV 240 64 Pass 283 327 exc H D A CL closed pos vent A l R 3853194 1 ADAPTER vent hose to manifold 56 61 Pass w closed vent 8 cyl 5646189 1 ADAPTER ASSY vent valve CV 213 62 Pass w closed vent 8 cyl 5646190 1 ADAPTER ASSY vent valve CV 214 64 Pass w closed pos vent 6 cyl ARRESTOR c case vent hose a cl to valve rocker cover 64 Pass w closed vent A l R exc F I 6 cyl 3849856 1 flame 64 Pass closed pos vent w oil bath A CL 6 cyl 3857476 1 ARRESTOR flame c case vent 63 Pass 8 cyl 64 Pass 6 cyl exc closed vent H D A CL 581112 1 GROMMET vent valve 63 Pass 8 cyl 3831671 1 GROMMET vent hose connector Note 2 NOTE 2 Grommet 3831671 replaced grommet 3715628 and retainer 3727693 Remove metal retainer from block 38 64 Pass 3845783 1 GROMMET vent hose conn at rocker cover for 1 dia hole l D x Wu O D x V thk 38 64 Pass 3933188 A R GROMMET Wu l D x 1 z O D O 386 64 Pass 3894337 A R GROMMET D x 1 z O D 62 Pass P B w C A C 6 cyl exc P G 62 Pass 409 exc P B TEE crankcase vent hose and positiive 64 Pass P B w dual 4 BC 409 3792330 1 vent pipe connector 62 Pass closed vent w P G 8 cyl 62 Pass closed vent w C A C and P G 6 cyl 3813853 1 TEE vent hose 63 64 Pass w C A C Custom Air Cond Prod P B 6 cyl 63 64 Pass w Access P B 3794177 1 TEE vac power brake 1 V 2 O L 63 Pass w P B C A C exc H Per 64 Pass w C A C 409 3825962 1 TEE vent hose 64 Pass w P B P G All Weather Air Cond 8 cyl 3863118 1 TEE ASSY vac inlet manifold 64 Pass w P G All Weather Air Cond 8 cyl 3891524 1 TEE ASSY vac inlet manifoId 7 447 56 57 Pass w pos vent 3725773 A R GASKET sheet metal connecting Note 3 NOTE 3 On models prior to 1956 enlarge passage and relocate holes as necessary Y 1970 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION P A 30 1 23 1 745 1 745