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I believe these water pumps were used on all small block SHP engines with a tapped boss on the top of the pump for the bypass hose fitting. Did all of the 326 pumps have a tapped 5/8" opening for the 87 degree elbow or were some larger than 5/8" and require a threaded adapter? Thanks in advance, PT
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Re: '63-'67 SHP Water Pump #3859326
Hi Pat,
Actuality the correct termalogy should be for orginal pumps is 1/2 NPT(national pipe thread). This was used on the 3782609 pumps on the 1962 cars, the 3839175 pumps on the 1963, and the 3859326 pumps on the late 64-67 cars. The larger 3/4 NPT is the later replacement pumps that require a bushing.
Hope this makes sense
Page Campbell -
Re: '63-'67 SHP Water Pump #3859326
Page, the water pump I need must have a 5/8" inlet hole in the top boss, without the use of a threaded bushing. You pointed out 1/2 NPT, don't you mean 5/8 NPT? Thanks, PTComment
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Re: '63-'67 SHP Water Pump #3859326
Patrick------
It's 1/2" NPT. However, keep in mind that in pipe thread size, 1/2" does NOT mean a 1/2" OD of the fitting. 1/2" NPT measures about 5/8" in OD.In Appreciation of John HinckleyComment
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Remember when refering to "pipe thread" size
you are speaking about the inside diameter (ID) of the "pipe". Outside Diameter (OD) measurements vary with the strength of the pipe (schedule 40, schedule 80...etc)
tcComment
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