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In addition to installing the new camshaft, Jeeps R Us also sent the cylinder head out to have the valve guides checked (they were fine) and installed a new Banks Torque Tube header to replace our old cracked aftermarket unit. The machine shop resurfaced our head as a precautionary measure, but since it had already been cut by Golen's, our compression is just borderline for the crappy 91-octaneCalifornia premium fuel.