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The ACL Trimetal main bearing set for Chevrolet Gen III V8s (4.8/5.3/5.7/6.0L; 1997–on) is a trimetal crankshaft main bearing kit that supplies precise bearing surfaces and oil groove configurations. Intermediates referenced as 5M7298 feature a 120 oil groove on the upper surface, while the thrust bearing carries a 180 oil groove on the upper, making it suitable for Gen III rebuilds matching those groove and flange requirements.
ACL TRIMETAL - Chevrolet V8 4.8/5.3/5.7/6.0L Gen III 1997-on Engine Crankshaft Main Bearing Set
