I really hope for a 4.20 max bore. Probably have to be siamesed to do it. The 6.1's have the room for bigger sleeves for sure. A 9.60 deck would the end game for any other competition lol! Just imagine a set of Thiteks flowing 420cfm and a 485" Gen III that could spin to 8500! LS guys would be inebriated.
