Do not accept any substitutes for the best bearing in the industry... CLEVITE! This combo is for performance "H" series rod and main bearings for the Gen3/4 LS engines. P/N CB663HN x 8 / MS2199H. The "H" series rod bearings are narrowed to accommodate large radius crankshafts, and main bearings have grooved upper halves and plain lower halves.
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