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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: Aug 2011 Posts: 33 New Guy | | New Guy Joined: Aug 2011 Posts: 33 | Last year I picked up a 1953 Chevy 6400. I thought at the time it had a 235. The water pump needed replaced so I went to the local NAPA at got a water pump for a 235. It looked just like the one I pulled off. Later I scraped 60 years worth of grime off the bottom of the block and found the casting numbers. The numbers are for a 261 from 54-55.
Do I need to re-replace the water pump and thermostat?
Thanks in advance. | | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | The 1953 216/235 and 54/55 235/261 water pumps may be interchanged.
| | | | | Joined: Aug 2011 Posts: 33 New Guy | | New Guy Joined: Aug 2011 Posts: 33 | Phew... I replaced all the hoses, thermostat, water pump and flushed out the old coolent. I really didn't want to spend anymore money there. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | The 1954-55 1st 261 water pump has a larger outlet for the lower hose than a 235 pump, but the 235 pump will work fine as your radiator is most likely set up for the 235 hose size.
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