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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!
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| | | | Joined: Sep 2006 Posts: 73 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2006 Posts: 73 | i need a new water pump on my 261 in my c60. of course parts stores don't list 261s because they were only in big trucks. is the 235 pump identical? | | | | | Joined: Jun 2005 Posts: 388 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 388 | As can be seen from the Master Parts Manual , a 235 pump should fit a 261 from the same year etc. Is your 261 the early (54-55 first) or late version? I have used water pumps from 216s and 235s on 261s, all depending upon the pulley sizes desired, etc. | | | | | Joined: Mar 2008 Posts: 60 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2008 Posts: 60 | The 261 water pump has a extra water outlet next to the heater outlet. This is a thermostat bypass that goes up to the thermostat housing . This lets water flow through the block when the thermostat is closed to stop hot spots in the engine. | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | I've gotten water pumps labeled for 235's that were drilled and tapped for the extra outlet. You can add an outlet if you need to, its just a 1/2" NPT pipe thread.
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