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Is the 1/2 pickup realy that important? Since the passages inside the block after it threads in are not drilled that big the rest of the way to the pump does it make much diff.? thanks

Part of doing the 1/2 NPT pickup mod is to drill that passage to 5/8", which is the ID of 1/2 pipe. How important is it? Well, that depends if you need it or not! Nothing is cut and dry.