Joe, I came across 2 potential sources for rebuilt water pumps for your 248:

Dan's Classic WATER PUMP, REBUILT - GMC 228, 236, 248, 270, 302 w-7/8" pulley (I'm not associated with this vendor or have ever purchased from them)

Ebay seller offering a 1939-59 GMC Truck 10/35 228 248 270 I6 rebuilt water pump 598309 new 5/8" pulley (also not associated with this seller)

As an alternative, post an ad in the Truck Parts Wanted forum and see if there may be a fellow Bolter that has one you could purchase.


~ Dan
1951 Chevy 3 window 3100
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"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)