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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Feb 2003 Posts: 452 Shop Shark | | Shop Shark Joined: Feb 2003 Posts: 452 | Help!
I have a Canadian 1949 GMC 3/4T, originally a 216 engine. Cracked head, valves shot, etc, so I sourced a 261. I have the adapter for the 216 water pump, and have drilled and threaded the block for the extra bolts. I have the 216 crank pulley installed as well. The engine has an AC Delco alternator. All the pulleys are aligned.
My problem is the water pump seals keep failing. I'm on my third water pump. Frustration is setting in. Have I missed something? I did notice that the added holes in the block are not into a machined surface, and over tightening there can distort the pump case, so those are just snugged to seat the gasket, no more.
Current fleet (subject to change w/o notice) \'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run. My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787. Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.
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