I need help in determining what is the correct water pump for my 72 LT-1 with factory air. I believe that the judging manual may be incorrect. I have located a water pump GM # 330813 as indicated in the judging manual. However, it states that the pump has a boss for a by-pass port, but they are not drilled for the port. Every pump I have seen for this application seems to have the boss drilled. Please advise as I need to replace my water pump due to leaks. Thanks very much
Marty
Marty
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