It goes without saying that if you are rebuilding a bone stock 1600 DP the factory took care of most of the fine details. BUT, how many times has it been rebuilt and how many hands have gotten in there and used parts from what they had laying around????? Rocker Arm Geometry done wrong or overlooked will wear out your valve guides and cause HP robbing friction. It will prevent you from getting the maximum RPM your looking for with that new Hot Rod Camshaft you just installed. I'll show you some problems to look out for and how to correct them