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Old 11-28-2010, 12:18 PM
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Join Date: Oct 2006
Location: Indian Waters, Florida
Posts: 136

Deleting EGR system from a 420 SEL. Would anyone know the thread type and pitch of the threaded female hole in the exhaust manifold? Just from inspection it's a fine "bolt" or straight (untapered) pipe thread. This same thread type is common all over the engine. Detroit irons always use a standard tapered pipe thread (NPT). Just wondering if they use a bolt, or straight metric pipe thread? Have sone other things to plug and this would be useful info.

TIA, Dave
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