If you take Jeff's reply and change "Erik" to "NHRA" That's pretty much how a rule is supposed to be taken. Not everyone at indy was illegal because none of my stuff has the bolt hole exposed what so ever because i take the rules as "written" and let the Tech officials figure it out.If anyone thinks the 2 cc's you gain from the two different interpretations of the rule is going to be the difference between 8.90 and 8.30 they are sadly mistaken! Im all in favor of NHRA adding "At the valve cover sealing surface" to the rule book, that way people can take the rule as written!!!!!!!