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Re: air injection manifold plugs
When I had to replace the air injection tubes on my 350, we drilled the old flare nuts out and cleaned the threads up with a pipe tap. We discovered that they were a standard 1/4 inch NPS thread and dug up a straight plug tap to do the job.
A 1/2 by 20 plug would work worse than a 1/2 by 13 plug as the normal pitch of a 1/4. inch pipe thread is 14 TPI
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1989 Silverado K2500ECLB- 307K miles with 90 K TBI 350-Not a show truck, a work tool that I can drive!
1998 Dakota EC 250K miles- I guess I'm just a truck guy now!
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