{"product_id":"acl-trimetal-reinforced-rod-bearings-toyota-4a-ge-4a-gze","title":"ACL Race Series connecting rod bearings for Toyota 4A-GE, 4A-GZE","description":"\u003cp\u003eACL Race Series connecting rod bearings for Toyota 4A-GE, 4A-GZE (part number 4B1780H), designed for engines that will operate under much higher loads and RPMs than stock.\u003c\/p\u003e\u003cp\u003eThe structure is tri-metal, with a steel base, copper-lead-tin lining, a nickel barrier, and a soft overlay that conforms and prevents seizure even under very high loads. On the rod bearings, the overlay is thinner to better withstand fatigue.\u003c\/p\u003e\u003cp\u003eThe Race Series feature higher crush and a slightly more eccentric shape than standard bearings—two details intended to keep the bearing from moving and ensure proper lubrication even as the block and connecting rod deform under load.\u003c\/p\u003e\u003cp\u003eIn the standard size, ACL specifies them for a crankpin diameter of 41.985 to 42.000 mm, with a bearing width of 17.1 mm. For that diameter, they recommend an oil clearance of about 0.047 to 0.055 mm, measured with a micrometer and bore gauge. If the crankshaft has been reground, the dimensions will change.\u003c\/p\u003e\u003cp\u003eThey do not have the silver-tin final coating of standard bearings, so their dark color—ranging from brown and black to bluish—is the factory finish and does not indicate any defect. ACL advises against polishing the bearing surface to adjust clearance; if more is needed, combine them with the HX version, which provides an additional 0.025 mm of clearance.\u003c\/p\u003e\u003cp\u003eIf the crankshaft has been reground or you are unsure of the required size, please write to us with your engine code before ordering.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":50813122773326,"sku":"ACL-4B1780H-STD","price":57.67,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0816\/7329\/0062\/files\/acl-rod-bearings_85aa1d89-7856-465a-af42-aa70d2bda3ac.jpg?v=1735903922","url":"https:\/\/driftandgrip.com\/en\/products\/acl-trimetal-reinforced-rod-bearings-toyota-4a-ge-4a-gze","provider":"Drift \u0026 Grip","version":"1.0","type":"link"}