water pump bypass tube

I am in the final stages of my 460 build. The water pump that I bought does not have the tube for the bypass in the pump, just a hole for it. The only fitting that I could find for it is 5/8" diameter. The hole is about .585, the tube is .625. Before I crack the new pump trying to drive the tube into it, any ideas on how to proceed?

doughbro wrote:I am in the final stages of my 460 build. The water pump that I bought does not have the tube for the bypass in the pump, just a hole for it. The only fitting that I could find for it is 5/8" diameter. The hole is about .585, the tube is .625. Before I crack the new pump trying to drive the tube into it, any ideas on how to proceed?

Sounds as if that hole was supposed to be tapped to a 3/8 NPT pipe thread but, somehow that operation was deleted along the line.

Hmmm. I think that they are usually pressed in, but your idea might be the answer. The dimensions are close enough to try threading the hole, even if they aren't perfect threads, some pipe sealer will fix that. Thanks for your suggestion.

doughbro wrote:Hmmm. I think that they are usually pressed in, but your idea might be the answer. The dimensions are close enough to try threading the hole, even if they aren't perfect threads, some pipe sealer will fix that.  Thanks for your suggestion.

Some of the aftermarket ones are threaded.

3/8" pipe tap worked like a charm. Thank you for the help.