RE: Valve Travel on a stock 89 LX 5.0
 

Those are good points. I never thought about the head milling thing but what you're saying makessense to me. I am not sure why he had the head milled but he did. 2 different shops verified that there was not any cylinder wall damage. The wrong piston was the valve reliefin the new one was much larger than the factory. The new shop said this is what was causing some of the compression issues in that cylinder.