{"product_id":"main-bearing-set-1339","title":"Main Bearing Set","description":"The ACL Race Series engine crankshaft main bearing set (part number 5M1957H-4B1956H) offers superior performance and durability for racing engines. These bearings are constructed with a high-strength overlay plate and reduced thickness for improved fatigue resistance, a critical factor in high-RPM environments.\n\nEngineered with a unique combination of design, metallurgy, and engineering, the RACE Series bearings are built to endure where others might fail. They feature hardened steel backs for better support and retention, increased crush for improved grip, and elimination of flash plating on the back to enhance heat transfer. The design also includes increased eccentricity to compensate for bore distortion and assist in forming hydrodynamic oil films, alongside 3\/4 grooved main bearings for optimized load carrying and oil flow.\n\nThese bearings boast tight, consistent wall tolerances for precise clearances and incorporate enlarged ID chamfers to accommodate performance crankshaft fillet radii. They are available in STD, .025, and .25 sizes, with specifications including identical halves, F781 material, and dimensions such as a maximum wall at crown of 1.499 mm and a maximum overall length of 18.5 mm.","brand":"ACL","offers":[{"title":"Default Title","offer_id":52686754840888,"sku":"5M1957H-4B1956H","price":76.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/660671325.webp?v=1784876353","url":"https:\/\/store.motormia.co\/products\/main-bearing-set-1339","provider":"MOTORMIA","version":"1.0","type":"link"}