I purchased the Isky cams piston notching tool last week. Started the first piston, placed the gasket and head on the block with the tool in intake valve number one. Tapped the tool till it hit the piston and set the collar to the depth I needed the valve to be cut. After removing the head when the cutting was done, I immediately noticed that the notch was below the stock relief. Is this normal? Has anyone used this tool before with the same results? I have stock 91 pistons and the notching tool matches my new valve size of 2.02 exactly. What gives, I try to do a clay check but now the clay is sticking and I can't get a good reading. I even tried oil on the head and piston. Still sticks to the head. Has anyone put edelbrock RPM heads with 2.02 valves on a stock bottom motor without any clearance problems before?