Does your hydrovac look like the one in the link from my reply above???
Those pictures looks very similar to the picture I have a screenshot of below that came from my 1966 Chevrolet Parts Truck Illustration and Special Information Catalog.
That pic displays the diagram for a 1960-64 Series 50-60 model hydrovac unit, which corresponds to the part number info I mentioned above.
Any way you can provide a pic???
Dan
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
