The idea of 7/16-20 came from measuring the mating air manifold. It is
a 7/16-20 UNFstraight thread, it is not a tapered pipe thread. 1/8
pipe is a bit smaller and the pitch is close so a 1/8-27 pipe plug
screws in, that doesn't make it the thread size.
John, Fogelsville PA
Bud Osbourne wrote:
Nope. The B series head uses the same size as the A series. > Dunno
where the idea of 7/16 x 20 came from.
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