Main Rod Cam Bearings Fits 97-03 Chevy GM LS 4.8L 5.3L 5.7L 6.0L The crankshaft, connecting rods and bearings are extremely important in every engine build, because they convert the reciprocating motion of the pistons into rotational torque. The longer the stroke, the greater the leverage effect and the greater the torque output of the engine. Time will come that your engine bearings will wear out. Always remember, when your engine bearings fail, a replacement bearings should immediately be installed. Be sure to have your crankshaft bearings, and connecting rod bearings replace with our aftermarket engine bearings as soon as it starts to give you trouble.