05-11-2013, 02:41 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
You should be good with 1/4 NPT. I find NPT (tapered) threads aren't cut very deep these days and I clean quite a few of them out with a tap so the fitting will go in.
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