well if they are pipe threads (tapered) and i'm guessing they are, then they aren't made to screw all the way together like you may think.
The rule of thumb is it should get pretty tight within 2 and a half turns.
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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