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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: Feb 2006 Posts: 549 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 549 | Sealed system with expansion tank and 16# cap.
Any reason not to set this up?
| | | | | Joined: Mar 2006 Posts: 1,703 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 1,703 | 16# seems allot to me , but the experts will chime in soon. | | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Depends on how good your system is!!!! I only run a 4lb but my radiator has a new core but the ORIGINAL thin top and bottom tanks!
I'd say a 14lb should be gosh plenty! If I remember correctly every lb of cap pressure raises the boiling point 12 degrees BUT DON"T QUOTE ME ON THAT. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | What year engine and radiator? | | | | | Joined: Jan 2008 Posts: 4,960 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,960 | I see no reason for that kind of pressure. A good 50/50 premix coolant will raise your boiling point to where you should never approach it. For what you gain in raising the boiling point, you lose by running the risk of blowing hoses, heater cores, etc. | | | | | Joined: Feb 2006 Posts: 549 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 549 | I'm torn. 16 sounds a bit high to me as well, but nearly all modern cooing systems use it. Maybe I'll look for a little less... What year engine and radiator? Radator is original and engine is 350 out of a 1980 vette. I will likely replace the radiator with a new one. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
If you are not using the original radiator nor the original heater, you should be safe with higher pressure as long as the engine, new radiator (and new heater core) are for vehicles that ran with higher pressure.
| | | | | Joined: Feb 2006 Posts: 549 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 549 | Problem solved. I got a 7 pound cap without the flip up pressure release. | | |
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