32x 12-Point Hex Nuts. 8x Extended Studs. 12x Long Studs. For Chevrolet 454 (7.4L) V8 Generation VI Big Block Engine 1996-2000. For Chevrolet 454 (7.4L) V8 Generation V Big Block Engine 1991-1995. For Chevrolet 454 (7.4L) V8 Mark IV Big Block Engine 1970-1990.