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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: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | I would start with 4 and only go up if you have overheating problems. A pressure system allows more heat transfer because it allows the water to be hotter before it boils over. If it doesn't boil over at 4 then leave it alone, it will be easier on the seals. 7 may be safe but I wouldn't go there unless you need to.
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