Radiator woes: What radiator for 67-72 GM pickup?

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10-11-2006, 05:37 PM

#21

Stu Cool

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Quote:

Originally Posted by shifty`

I saw that and really liked it, but I don't want to take my water pump off, and I am afraid of getting shavings in the water pump when drilling and tapping it. Also, is the stock waterpump ferrous? Or is it alum? Seems like a brass elbow would not be good with iron water pump, but then again, iron water pump on alum engine block wouldn't make much sense either :crazy:

I drilled mine on the motor. I coated the drill and tap bit with grease so the shavings would stick to them. Then I took my shop vac and stuck the nozzle up the waterpump outlet and turned it on while I drilled. With those precautions I am satisfied that I did not leave significant shavings behiind. The pump is aluminum and the walls are pretty thin. You should not overtighten the NPT fitting as it gets wider as it goes in. I suppose it could crack the pump housing if it was tightened too much.

Pat