World Products is offering a new Gen VI big block compatible design. This block uses a one-piece rear main seal, and has the Gen VI style oil pan rail and front cover bolt pattern. The block can utilize either the OE type roller lifters or +.300 tall tie bar lifters. It also features a Mark IV style fuel pump boss and oil filter pad. The water jacket and deck surface will accommodate eitherMark IV or Gen V-VI style cylinder heads, making this block extremely versatile.