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Well thanks for the info,but,I have that same radient heat coming off the top of the motor..However I am using the stock cast water pump housing that ran that motor for over 150k miles..I have sat in bumper to bumper traffic for over 2 hours and it ran right at 185 dg..great right? It was in the 90's that day..problem is over 3000 rpm the temp just keeps climing..if I go back to slow traffic the temp drops down again..I can drive around town all day with no problem,,,get out on the Interstate I can watch the gauge go up until I gotta stop.Did the same stuff with the t-stats and different water pumps,,lower hoses.Heads off 4 times ....even a different block...std bore....yes it is hot .ck with temp gun..and it's really hot



If you don't have a spring in your lower rad. hose, I'd be willing to bet that's the problem.

My small block had the same issue. I installed a lower rad. hose, and it solved the problem...