Description Clevite 66+ Buick Cadillac Chevrolet GMC Oldsmobile Pontiac V8 305-350-400 .020in Undersize Connecting Rod Bearing Set – cleCB663P20(8) Engine Connecting Rod Bearing Set; Size .020in Undersize Series P Series (Tri-Metal) Material Grade OE Replacement Ideal for rebuilding engines where more demanding use is anticipated, such as heavy duty, motorsports, or street performance. As it is the most versatile replacement engine bearing, P-Series is suitable for most OE applications. Due to the increased load capacity of the TriMetal design, it is a suitable upgrade from BiMetal engine bearings.