It is factory-installed in the Ford Mustang Cobra Jet and Dodge Challenger Drag Pak programs and meets NHRA requirements for the current FX (Factory X) class

Derived from the acclaimed 129 Series

differentials and other related driveline components on cars

By choosing the long rod kit

which are optimized for limited driving conditions

S58 Billet Main Caps by 5150 AutoSport X4 G02 It is factory-installed in the5150 AutoSport S58 Billet Main Caps As power levels climb beyond 1,200+ horsepower, we've seen factory main caps begin to walk. Under extreme cylinder pressure and crankshaft loads, even the slightest cap movement can affect main bearing alignment, oil clearance, and ultimately bearing life. Our CNC machined billet steel main caps are heat treated for maximum strength and feature a dowel pinned design to positively locate each cap and virtually