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: Difference in Measurement of Long and Short Waterpump winmon Oct 20th, 03, 03:03 PM Dumb questions...What is the measurement of a big block "long" water pump and a "short" water pump? Also, what direction does a standard rotation water pump turn? Just trying to make sure I have the correct pump. Thanks! TJS69 Oct 20th, 03, 05:32 PM For a Big Block Chevy : short pump = 5 3/4 long pump = 7 1/4 Dimension is from front of hub to mounting surface. Rotation on pre-87 engines should be CW. (clockwise) | ||