Not Ranked
Steve,
Mine are 7/16" and I use a combination wrench. I can get them from the top but you need to loosen them at the same time on each side so you can pull back the manifold. If you try one bolt at a time the wrench hits the headers and you can't get any turn on it.
I am just picked up a new set of header bolts today. The head size is reduced so I will be able to get a socket on them in the future. (take your plugs out first, it helps).
Ken 2560
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