even if it was a broken cam, some valves would be open, some would be closed. you would still have valves hitting pistons REAL bad then, and still have compression on the cylinders with the closed valves. on these 4.0's, are the rockers shaft mounted? is it possible that the shaft has come loose to not allow the rockers to push the valves down? that would "theoreticaly" (sp) cause no compression as no valves open/close to allow movement of air. i still think it has to be something to do with valves. not cam. there are always open valves, closed valves. all positions. tom did bring up a good point. BAD COMPRESSION GAUGE?? maybe try a second gauge? dave stohler http://picasaweb.google.com/das24rules ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list