Made out of 7/16" O.D. chromoly steel tubing for strength and durability Adjustable to work with all stock or aftermarket cams Compatible with solid and hydraulic lifters 93",113" 4" Bore using +.500" Deck crankcase, Cylinder length 5.5000" (-.50")/4.995 or 117" 4-1/8" Bore with 6.000" cylinder deck height with cylinder length 4.889"