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Old     (loudsubz)      Join Date: Aug 2001       06-07-2010, 6:30 PM Reply   
I have a drain plug on my exhaust manifold and it uses a standard 1/4" NPT thread on it and small 1/4" bolt that you can buy in any hardware store.

Problem is the hole is all corroded from rust over the years and I need to clean it out.

For the life of me I can't figure out what size tap to use to clean it out. I have tried 7/16 but its a little too small, and the 1/2" taps I have used are 13 and 20 and the 20 seems to work the best but it wont thread on all the way through on a test pipe I have, it only goes about 3/4" in.

Anyone know the correct thread pitch for this?

 
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