hello ive removed the lash pad from the 5 cyl.exhaust valve rocker on my 71 240z..the pattern looks centered but if i look close it seems to have a dip or groove in the center of the wipe pattern...is this normal???? im thinking worn....im checking them bacause ive got alot of valve noise in some rockers , clearance is good checked it 3 times..and its only in the 5-6 cyl.valves i hear it the most with a stethascope type mechanics prob from on top of the valve cover...is there a easy way to check lash pads ?? ive check the archives saw somthing about inking the pads?? and wheres the best place to get new stock pads if i need them?? thankyou michele