Enginetech BC409J BB253J Main and Rod Bearing Set for 1997-2011 GM Chevrolet Gen III IV LS 4.8 5.3 6.0 6.21997+ Chevrolet Gen III IV LS LQ4 LQ9 LS1 LS2 LM7 4. 8 5. 3 6. 0 6. 2 Crankshaft Main and Connecting Rod Bearings Set Enginetech Rod & Main Bearings Enginetech main & rod bearings the choice of rebuilders for over 25 years. About ten years ago, when aluminum bearings were first being introduced, Enginetech continued to produce the higher quality tri metal 780 bearings. Enginetech stuck firm with the 780 tri metal material for years because it was far