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New Ford 351 with GT40 heads overheating at idle need help bad

if you picture above you show hex head bolt with out threads on the first 1/2 or so, does that part matter? I assume that the bushings has to be lose enough for the threads to clear.

Thanks for your help, I hope this solves the problem.



I may not be following you, but I'll take a stab.

The portion of the bolt that will penetrate the bushing ONLY, will not have any threads in this area.
This is the "shank" area of the bolt, and will ensure a good fit between itself and the ID of the bushing.


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