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Replacement Exhaust manifold plug size
Truck is a 1968, C20 with the factory 396. Left exhaust manifold cracked so I bought a replacement and installed it. The new manifold has the AIR holes and the large threaded home near the exit point. I have straight pipe plugs in the 4 AIR holes, and that works great.
Any idea what size and thread the hole is near the exhaust exit?
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