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It is the Weiand pump that has the blocked recirc passage, not the Edelbrock pump.

Think for a moment. If the recirc passage is blocked, and the thermostat is closed (the motor is cold) how can the coolant pump circulate coolant? It can't, you have dead-headed the pump.

If there is no coolant circulating, what is happening to the coolant within the cylinder heads? It is turning into steam, forming steam pockets, the head is developing hot spots.

Then to make things worse, hot coolant finally migrates to the thermostat, the thermostat opens and allows a slug of cold coolant to circulate through the block, when the cold coolant hits the thermostat it slams closed again.

So you have a cylinder head with hot spots, then you thermally shock it with cold cooolant. And this happens over and over until the motor reaches operating temperature. and this happens every time you start the motor.

Sitting in the cockpit, you watch the needle on the temp gage stay at the far left of the dial instead of gradually moving up the scale. Then the needle pulses suddenly towards full scale stays there for a moment, and then swings back to the left end of the dial. It pulses over and over like this until the motor finally warms up.

cowboy from hell