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I am planning to rebuild my motor this winter using gt 40 heads and need to open the bolt head up to match the 351w. Does anyone know the minimum size they should obe opened to? I know it's a half inch fastener but how much additional should there be? Is it .505 .510 etc? Thanks for any help as someone has a mill to do it on but just needs the dimension.
 

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.531 is the number you want, or 17/32's if you want to get all "fractional" about it. :toothless

Your machinist should have been able to tell you this based on the bore of the o.e. 351 heads. ;)
 
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