[QUOTE=champ;664312 I really do think there is a lot of water pressure with the two new pumps helping to hold the thermostat closed.[/QUOTE]
No, your two pumps are not additive. The raw water pump is positive displacement and can produce pressure.
The circulating pump is a centrifugal pump and is designed and plumbed to only circulate water in the engine.
If you had a jillion HP, a Merc drive, and could go 80 MPH, you might see higher pressure, but as Sean said,
the thermostat operation is a heat function. Period!
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