id run a ET radial. Friend ran their 27.5" tall drag radial. with the 6speed youll need to slip the clutch out of hole to get best results with the radials.


bias ply and radials dont mix well, youll get sway on the big end, unless your a bias ply tire up front.


with the 488s and that cam in the 4.8 plan to spin 7500 rpms which will give you some room on the big end. 30" tires and 7500 rpms is good for 136 mph in 4th.