Motive Gear Ring & Pinion GM 8.5/8.6 3.42 Ratio SR42603A-SFI * The special valvetrain in

* The special valvetrain in the 1970 340 T/A is not compatible with these cylinder heads

Used by top racers in all forms of racing

and other applications in which clearance is limited

our keyway timing set for Chevrolet 454-502 GEN VI Big Block is built with bullet-proof durability

1986-1986 GMC C2500 Suburban

Motive Gear Ring & Pinion GM 8.5/8.6 3.42 Ratio SR42603A-SFI * The special valvetrain inMotive Gear offers some of the toughest drive train components on the market today. If you are looking for the largest line of performance ring and pinion gear options available with gear sets in a wide range of ratios for nearly every application, both on and off road, check out Motive Gear. Motive Gear products can be found in the winners circle at racing events worldwide. The superior quality of Motive Gear components is the result of years of