97 4.0, D1, i have an engine problem, more of a valve train / engine noise combined with low oil presure,i just installed, new std cam bearings, and a stock cam. the cam i installed fit, but had green and purple paint markings. i see in the rover manual that the color for the camshaft should be "orange", for my application. do i have the wrong cam in this thing? or the paint thing is bs. ?