07-29-2014, 05:57 AM
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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
I put the tap right to them as the holes are no where near deep enough for the fitting to have any thread sealing area. When the NPT holes are tapped out to a decent size I use ARP thread sealant or Loctite PST on them.
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