King Engine Bearings Honda J30 / J35 (Size STDX) Tri Metal Main Bearing Set

The STDX designation on these King Engine Bearings means they're built with a tri-metal material, which is a step up from standard bearings. This tri-metal construction offers a good balance of strength and conformability, helping to cushion the crankshaft and reduce friction. They are specifically sized at STDX, which is a standard undersize, meaning they are intended for crankshafts that have been machined down by 0.001 inch. This set is for the main bearings on Honda J30 and J35 engines.

King uses a layered approach with their tri-metal bearings. The top layer is a bearing alloy, followed by a middle layer of lead-tin, and then a steel backing. This design helps to handle higher loads and temperatures compared to simpler bearing designs. For anyone rebuilding a J-series Honda engine, especially if the crankshaft has been reground, these bearings are a solid option to ensure proper oil clearance and long-term durability.