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Click on image for the lowdown. 
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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: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | Yes that is the relief valve. It should be a 4 psi valve. The original radiator cap did not have a pressure relief valve.
The "stopcock" is your fill indicator. You should stop filling when coolant comes out there. You probably have your coolant level high. Set it at this level and try again. That may cure the puking. | | |
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