King Engine Bearings MB5667SI SI-Series Main Bearing Set Standard Size

King Engine Bearings

<h3>Precision-Engineered Engine Bearings Since 1960</h3> <p>King Engine Bearings was founded in 1960 with one simple objective: to supply the highest quality bearings available in the marketplace. Over six decades of specialization have made King a recognized leader in bearing technology for internal combustion engines across automotive, heavy-duty truck, marine, aviation, and standby power applications. Unlike manufacturers that produce a broad range of components, King's exclusive focus on engine bearings has enabled the company to develop unparalleled expertise in bearing metallurgy, precision manufacturing, and performance optimization.</p> <p>What sets King apart is their commitment to controlling the entire manufacturing process in-house. King controls the product's entire supply chain from within their factory, with the production process starting with basic raw materials and ending with packaging and delivery of the final product. This vertical integration ensures consistent quality and allows for innovations that have redefined industry standards. As an OE supplier for the aerospace industry, their entire approach to quality is based on the strategy of zero mistakes, with the same principle applying to their automotive bearings.</p> <h3>Advanced Bearing Technologies and Materials</h3> <p>King's research and development efforts have produced groundbreaking bearing technologies that address the extreme demands of modern engines. King's R&D department develops and implements innovative bearing materials such as high strength aluminum alloys, lead free and extremely strong bronzes. Their proprietary materials include Alecular alloys, silicon-reinforced aluminum compositions, and advanced tri-metal structures designed for specific load requirements and operating conditions.</p> <p>The company's commitment to precision is exemplified by their Bull's Eye Tolerance™ manufacturing process. Bull's Eye Tolerance™ combines highly accurate machining, over-plating, and computerised wall thickness monitoring that adjusts the process on the spot, outperforming the industry's wall thickness tolerance and ensuring the least thickness variation shell-to-shell. This level of precision allows engine builders to achieve exact oil clearances without the time-consuming trial-and-error methods traditionally required.</p> <h3>Performance Bearing Solutions</h3> <p>King's product line spans from OE replacement bearings to cutting-edge racing components. Their <a href="/380-king-engine-bearings-engine-connecting-rod-bearing-set-10300">Engine Connecting Rod Bearing Sets</a> and <a href="/380-king-engine-bearings-engine-crankshaft-main-bearing-set-10302">Engine Crankshaft Main Bearing Sets</a> represent the core of their offering, available in multiple material specifications to match specific performance requirements. For high-performance applications, King's XP and XPC series bearings feature pMaxBlack™ technology, a unique tri-metal structure that is 24% harder than any other conventional tri-metal race bearing.</p> <p>King's factory applied nano-composite polymer coating has proven to enhance wear resistance and protect the bearing during metal to metal contact. This innovation is particularly valuable in racing applications where bearings must withstand extreme loads, high RPM, and potential oil starvation conditions. The company also offers individual <a href="/380-king-engine-bearings-engine-crankshaft-main-bearing-5220">Engine Crankshaft Main Bearings</a> and <a href="/380-king-engine-bearings-engine-connecting-rod-bearing-5212">Engine Connecting Rod Bearings</a> for engine builders who need specific shell replacements or custom clearance configurations.</p> <h3>Trusted by Professional Engine Builders</h3> <p>King's reputation extends from professional racing teams to meticulous restoration shops and performance enthusiasts. King is the first choice in the extremely demanding aviation and racing industries due to their in-depth understanding of the specific needs of those industries, with this knowledge and experience then applied to every aftermarket bearing they make. The company has earned certifications as both a TS16949 automotive and AS9100 aerospace manufacturer, demonstrating their commitment to the highest statistical quality control standards.</p> <p>Whether you're rebuilding a classic engine to original specifications, building a high-performance street engine, or assembling a competition powerplant, King Engine Bearings provides the precision components and technical expertise necessary for long-term reliability and maximum performance. Their extensive catalog includes bearings for virtually every engine family, with multiple size options and clearance specifications to accommodate different build requirements.</p>