Its a sbc 350, in a 77' corvette, with a 60 over bore, an L82 cam, running off the center carb of a tri carb system, the car did not run hot before, and the shroud is in place. I'm putting the other carbs on now that the center seems to be set, and will run the car at idle, with the radiator uncapped to watch for movement of water and air escaping. I did not let the car run long enough to see if it would have dropped after the 210 was reached... if the radiator seems ok, I'll cap it and let is run to see what happens... thanks - much, kip