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Maybe go to the hardware store and find a nut or cap that size that fits the manifold and then use the nut or cap to get the threads started on the header. I remember that my AIR tubes would run out of threads before going on all the way on my 96 with the Pacesetter headers so I had to add a washer inside the AIR fitting as a spacer to all it to bottom out before it ran out of threads.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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