[Bub Whitaker]

Alan, the problem is that they don't know what you are referring to when you say radius seat. LT1 & LS1 heads came from the factory with radius cut seats from the bottom of the seating angle to the throat (bowl) and by the letter of the previous rules were illegal. So to make it easier for tech, I think they changed the rule to read any valve job, hence do any valve job - angles - radius - multiple angles - have at it