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Click on image for the lowdown. 
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| | | Forums66 Topics128,030 Posts1,055,428 Members48,422 | | Most Online14,466
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: 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. | | |
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