Not Ranked
I have the 1-3/4" pipes for my 351w and there's about 7/16" between the corner of the footbox and the header on the driver's side. I asked Barry (when he still worked at B&B) and he said that it would be fine being that close. I still ended up wrapping the header at that spot with header wrap to be on the safe side. I didn't weld my motor mounts until the headers were attached so I was able to push the motor forward as much as possible to get the most clearance.
Mike
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