Subaru Impreza ACL Race Engine Bearings Main Bearings Rear Thrust Standard Size 5M8309H GGS1366
Large chamfer to accomodate larger crankshaft fillets
3/4 groove to provide optimum oil supply to rods and to maximize load carrying capacity
Incresed crush and tighter wall tolerance for better seating
Improved overlay and reduced thickness for increased fatigue strength
Hardened steel backing to maintain crush under high loads and temperatures
ACL part number: 5M8309H-STD
ACL main bearings are made of a softer metal so that you don't wear out your crank or engine block. Additionally, a thin layer of oil lubricates the connection between the bearings and the crank, allowing the crank to "float" and reduce wear. Proper support via main bearings is crucial to prevent oscillations and wear that can damage the crankshaft and other components as the motor moves further out of balance.
Subaru main bearings are specific to either a #5 or #3 journal bearing position. Journal bearing position is not VIN or year specific, it must be known prior to purchase. This is located on journal no. 5. This is to fit rear thrust crankshafts ONLY!
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Subaru Impreza Performance Gaskets and Tuning Specialists Graham Goode Racing Lutterworth Road Aylestone Leicester LE2 8PH England Tel 0116 244 0080 / 0116 245 2320