Re: Crankcase Ventilation Filter
63 is the first year for a positive crankcase ventilation system. In that system, there are 2 pcv valves, one under each cover, and a crankcase ventilation filter in a housing located behind the left cylinder head. The part number for the pcv valves AC/Delco type CV623C, and the filter is Napa/WIX 2718/42718. I hope this is of some assistance in your search.
Cordially,
Lewis Ellis Matkin, Jr.
Ridge Manor, Florida
1965 1002 GMC V6-305E (soon to be 401M)
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