water pump flow direction

Ted Carlson said

The thermostat keeps the water circulating in the engine until it warms up. It then allows the engine water into the radiator at the top. Racers have complained that the cold water should go into the heads first, but it goes bottom to top. I'll bet someons has made a reverse flow water pump so the heads are cooled first

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Yeah Ted, someone made it alright, GM Generation II LT's "reverse cooling" system, allowing coolant to start at the heads and flow down through the block. This keeps the heads cooler, affording greater power through a higher compression ratio and greater spark advance at the same time it maintains higher and more consistent cylinder temperatures............ I've got one of these LT1's in my 90 Chevy pickup complete with a T56 six speed :)