I took my head off this past week, do a cracked from the center core plug over to the #3 spark plug hole. Any way I was looking at the 11mm arp studs and was wondering at what power level these would need to be upgraded. I decided I dont want to find the limits of the 11mm stud, and will be upgrading to a 1/2" stud. Im going to be making a fixture that will allow us to drill and tap the block with out taking it out of the car, and it will be perfectly perpendicular to the deck of the block using a hand drill and hand tap. This is the arp part # ar7.562-1lb (studs) # 200-8513 (washers) # 300-8304 (nuts) the total price was around $160. hope this gives us some added insurance the high hp TIII being built.
Adam