LT1-LT4 Modifications 1993-97 Gen II Small Block V8

NPT plug size in LT1 heads? Is it 1/4"-20?

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Old 02-03-2011, 12:51 AM
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Originally Posted by Wicked94Z
no the 1/4 npt plug will only thread in about half-2/3 of the way.
This would be correct for a tapered pipe thread.



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