Set of (8) +.010" under Size Clevite77 Connecting Rod Bearings for High Performance Big Block Chevy Engines. 348 366 396 409 427 454 502 GM engines. This set is for crank shafts turned .010" under size. These Clevite H-Series 77, Tri-Metal Connecting Rod Bearings fit the following:348 CID 5.7L Chevrolet V8 cylinder 1958-1961 (High Performance),409 CID 6.7L Chevrolet V8 cylinder 1961-1965 (High Performance),366 CID 6.0L Chevrolet V8 cylinder 1966-1998 (High Performance),396 CID 6.6L Chevrolet V8 cylinder 1965-1970 (High Performance),402 CID 6.6L Chevrolet V8 cylinder 1970-1972 (High Performance),427 CID 7.0L Chevrolet V8 cylinder 1966-1998 (High Performance),454 CID 7.4L Chevrolet V8 cylinder 1970-2000 (High Performance),502 CID 8.2L Chevrolet V8 cylinder (High Performance). Clevite HN-seriesbearings will be narrowed in place of the enlarged chamfer to provide greater crankshaft fillet clearance. The new narrowed bearings will be available with a HN suffix.