Jeep Clevite B-1, Bi-Metal Cam Bearing Set fits the following:304 CID 5.0L American Motors V8 cylinder 1971-1981,360 CID 5.9L American Motors V8 cylinder 1971-1991,401 CID 6.6L American Motors V8 cylinder 1974-1978.Clevite B-1 Cam Bearings are B-60 Steel backed bearing with a conventional babbit liningClevite Cam Bearing Set part number: SH671S (Standard)The first commonly used bearing material was an alloy of lead, tin, antimony and arsenic called Babbitt which was named after its inventor. Babbitt has physical properties similar to solder. Its soft which allows it to conform to minor imperfections in geometry and alignment of mating parts. This softness also allows Babbitt to absorb dirt and wear particles that might pass through the bearings clearance space. Babbitt is also very slippery which minimizes friction in the absence of oil during startup. Although Babbitt is the best bearing material based on its surface behavior, it has one serious shortcoming. By itself, in thick layers, Babbitt cannot carry high loads for long periods. Under the repeated cyclic loading of an internal combustion engine Babbitt will break up and flake out. This reaction to cyclic loading is called Fatigue. Bearings are typically constructed with a steel backing to provide support and allow the bearing shells to be an interference fit with their housing. The earliest insert bearings were Bi-metal construction with a lining of Babbitt. As mentioned above, although Babbitt offered optimum surface behavior, it lacked fatigue strength. It was found however, that the fatigue strength of Babbitt could be significantly improved by reducing its thicknes. Clevite B-1 Cam Bi-metal MICRO BABBITT bearings use a thinner layer of Babbitt lining to provide better fatigue resistance, and Tri-metal bearings which use an extremely thin electroplated overlay layer of Babbitt over a stronger intermediate layer to combine the surface properties of Babbitt with the greater fatigue str Brand: Clevite 77, Model: SH671S
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