Nuts are black oxide for and have a lead in chamfer to make starting the nut on the valve cover stud a quicker process. Hex is 7/16" so industry standard valve cover wrenches fit with no issue and there is a little extra height in the nut to make getting to the hex an easier task for the racer for between rounds maintenance. Nut is .750" overall height with a washer dia. of .600" and are sold individual.
Nuts are NHRA legal for big show cars and will work with Hemi titanium valve covers.
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