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Old 04-28-2020, 06:26 AM
Admirals Club Admiral's Club Member
Join Date: Sep 2019
Location: NE FL
Posts: 701
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Originally Posted by SweetD View Post
Could also be your water pump impeller. If it has not been serviced in awhile, the rubber impeller "arms" get deformed into a permanent shape that allows air to pass through with some water. This prevents enough water from getting up into the cooling passages, especially at higher RPMs.

See how curved the couple of arms are in the rear of this pic? Different from the rest. That's what I'm talking about. They allow air in with the cooling water.
I'm going to replace the head gaskets, thermostats, water pump and poppet valve. This engine is new to me and while I know it was well cared for, it's not much more work to start with a clean slate.