A Matter Of Timing
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Note the difference in the new style cam gear drive face on the camshaft in the block (right) compared to the standard flat-face camshaft (left). This different face on the cam indicates this is a hydraulic roller camshaft that also uses a cam retention thrust plate over the front of the cam. The two bolt holes on either side of the cam are used to fasten this thrust plate to the block. While difficult to see in the photo, there are also 0.030-inch holes drilled in the two outboard oil galley plugs (arrows) used to lubricate the cam gear and chain. View Related Article
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