King Engine Bearings Toyota 3K/4K/(Size +0.75mm) Main Bearing Set

Built with a bimetal aluminum base, these main bearings are specifically sized at 0.75mm undersize for Toyota 3K and 4K engines. When you're rebuilding the bottom end of your 1968-1979 Toyota Corolla, the main bearings are critical for supporting the crankshaft and ensuring it spins smoothly within the engine block. This set is designed to replace worn bearings, helping to restore proper oil clearance and reduce friction.

King Engine Bearings uses a bimetal construction, which is an aluminum-based alloy. This material choice helps manage heat and provides a good bearing surface for the crankshaft. Because these bearings are 0.75mm undersize, they are intended for use when the crankshaft has been machined down to match this specific size during an engine rebuild. Proper installation and ensuring the crankshaft journals are clean and within the specified tolerance for this bearing size are key to a successful rebuild.