Check the listing for details. KING CR808SI MB556SI Rod+Main Bearings Set for BBC Chevy 396 402 427 454 502. Condition: New. Listed at 54.98 USD. KING ENGINE BEARINGS This listing is for a new set of King connecting rod bearings and main bearings for big block Chevy 366, 396, 402, 427, 454, and 502s. P/N CR808SI (standard or oversize) and MB556SI (standard or oversize). Alecular material is used exclusively by King. It is an alloy of aluminum, tin, copper and several other elements. Because it is an alloy, it maintains its properties throughout its entire depth, delivering consistent and reliable performance. These bearings do not have enlarged chamfers required by most aftermarket forged steel crankshafts. We also carry these in the King Race series bearings, if you require a chamfered bearing. See our ebay store for other Chevy Bearings, and more! FREE SHIPPING WITHIN LOWER 48 US-STATES