Radiator condition was not mentioned in the original post.

I run a 13 psi cap on mine, I think that is what the stock cap is. I also run an OEM 88C/190F thermostat in my 22RE and it runs fine. Might also see if the radiator hoses are in good shape. Have heard of a soft lower hose collapsing at high RPMs from the suction of the water pump. Also how old is the pump?

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