Yep, it turns out Doug's are not the only headers to have these dimples for bolt clearance. It seems like it's just a byproduct how header primary tubes need to be routed to fit in Pontiacs. I'm not going to lose any sleep over it.
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1966 Pontiac GTO ( restoration thread)
1998 BMW 328is ( track rat)
2023 Subaru Crosstrek Limited ( daily)
View my photos: Caught in the Wild
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