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Air Injection - Hole Thread? 200

I'm trying to remove the air injection system from my '76 242. The holes under each of the exhaust ports on the head are threaded, but I can't figure out what the thread is. It seems similar to 1/4" NPT, but not quite. Doesn't seem to match any SAE or metric bolt thread either. Any ideas?

Thanks-
Eric
--
'66 122 Coupe 110k '97 850 Wagon 130k






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