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<DIV><STRONG>The separate, smaller hole in the top right section of a
pump recirculates water from the bypass disk which is blocked by the
normal 351C hat style thermostat when the engine is at operating
temperature.</STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG>Attached is a picture of the Edelbrock pump with the bypass
hole.</STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG>Attached is a picture of the Wieand pump with no bypass
hole.</STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG>Attached is a picture of the FlowKooler pump with the bypass
hole.</STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG>If you run a non-hat thermostat with a bypass pump, 25% of the
water will recirculate thru the block without going thru the
radiator.</STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG>If you use a non-hat thermostat with a non-bypass pump (Wieand),
water will not recirculate thru the block and the engine will warm
up somewhat slower.</STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><FONT lang=0 size=2 face=Arial FAMILY="SANSSERIF" PTSIZE="10"><B>The main
thing is to keep the main thing the main thing.<BR><BR>Do the best you can with
what you have where you are.<BR><BR>Have fun today,<BR><BR>sobill@aol.com
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