long story short. My car dropped a valve the crower retainer fell apart. and pushed in to my crower springs. Now when I tried to start the car after it happened it wouldn't crank. When I turn it by hand I can feel the piston hit the valve and then it won't move. The cams and head were installed by a professional engine builder and I know it's a faulty part, just by looking at it. No my concern is when that vale hit the piston. they are SRP pistons and I am under the belief they are fordged(are they). what damage could have been done to my piston?