King Engine Bearings Chevrolet 121Ci/Ln2 134Ci +.002 (Size +0.25mm) Main Bearing Set

When you're rebuilding the bottom end of an engine, the main bearings are critical for keeping the crankshaft spinning smoothly. This set from King Engine Bearings is designed for Chevrolet 121ci and LN2 134ci engines, and it's sized at +.002 inches, which is 0.25mm undersize. This means they're intended for crankshafts that have been machined down by 0.25mm to correct for wear or damage.

These bearings use a bimetal construction with an aluminum silicon base. This material is known for its good load-carrying capacity and wear resistance, making it a solid choice for main bearings. This particular set is the MB5834SI0.25, an updated version of the MB5557SI, and it fits a wide range of vehicles from the early 90s through the early 2000s, including popular models like the Chevrolet Cavalier, S10 pickup, and GMC Sonoma.

When installing these bearings, make sure to follow the manufacturer's recommended clearance and lubrication procedures. Proper installation is key to ensuring these bearings perform as expected and contribute to the longevity of your engine rebuild.