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My new waterpump has the same two holes too. I'm gonna use one to flow to the heater core and the other I think I'm gonna plug. I'm calling Pro-Filer performace to see if it's mandatory to run a bypass to their intake and heads. I've seen electric pumps used and no bypass used.
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86 SWB 9.0 LITER
T-400-OD 4.11 eaton-4/5 drop
Best 1/4 12.51 @112mph no traction 
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