The frying pan test is what made me a convert. But... showing worn cams rocker arms can contain so many variables. 2 different cars coming off the same assembly line are subject to material inconsistencies. Late 80's Ford Escorts were famous for soft cam lobes, but not all of them suffered from it. I replaced noisy lifters in my 1978 Chevy Monza "iron duke" and the cam and lifter surfaces were as shiny and smooth as the new ones, but I had sludge in the pan and under the valve cover from 8 years and 67,000 of Penzoil.