Just to add. This is what happened. Used Roush 200 heads with 2.02 intake and 1.6 exhuast valves. The car ran fine until I got on it hard and then some of the valves hit. Is this valve float or wrong pistons to Valve size?
Nope, those are stock pistons. You will have to check the p/v clearance just to make sure but I am assuming the shiny spots are the valves hitting.
Scott
Those don't look like my stock 1994 Cobra pistons.. mine had matching valve reliefs in all 4 and a slight dish in the center bisecting the valve reliefs...
Those look flatter on top and they can be installed either way on either side.....
Either way, yes you smacked your pistons with your valves. 2.02's are too big on the intake side, but usually you can get away with a 1.6 exhaust (edelbrock). However it appears you smacked both sides.
The Roush heads were used and I'm thinking some of the springs were not up to the task. I'm also thinking the guy had the rockers adjusted way to tight from the start. I ordered some Edelbrock 60329 heads. I'm going to verify clearance on these.