If you can only get afinger nail between the valves they a stg1's As far as how deep.. watch your installed spring hieght. the distance from the tip of the valve stem to the spring seat should be well under 2.1 according to some of the posts iv'e seen lately. more problems were showing up with the fast ramp cams than anything. make sure that the tip of your rocker does not try to roll of the edge of the tip of the valve stem @ full lift.
