Quote:
Originally Posted by Titomars
Most GM AIR injection tubes are fitted to the manifolds with flare nuts which are straight threads not NPT. I always use Allen head set screws. The size I have used is 1/2 X 20 the taper of the set screw tip is close enough to the 45deg flare which lets the set screw seal at the flare not the threads. I also use anti-seize on the threads for removal at a later time.
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I cut the air injection tubes and used a 22 mm to remove the them.
It looks like fine thread . An earlier post, Someone posted they used 19mm oil drain plug from Cummins diesel . Does anyone know year make model plug is from? Or if any of you can point out the plug I need would be very helpful . Thank you!