Engine Bearings - Garage Tech
ACL Race Bearings are comprised of four metals: a hardened steel backing, a high-fatigue copper-lead lining, a nickel barrier, and a lead-tin-copper overlay for further fatigue resistance. What they don't have is the more conventional flash coating that gives other bearings their smooth appearance. The flash coating elimination improves heat transfer, which helps keep the bearing seated in its housing properly.
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