Thread: Smog plug for back of 351w heads???? Who has them?
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Old 02-22-2011, 01:13 PM
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Jerry Clayton Jerry Clayton is offline
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isn't it like a 5/8 thread and the plug from ford has an internal 3/8 or 7/16 thread????If you aren't using smog system components you can plug it with a short bolt or tap it for NPT plug
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