In an engine, the relationship between the valves and the pistons is a precarious one. If there is too little space, they can collide. If this happens, the resulting carnage require replacing one of ...

The instance of piston striking valve is right up at the top of the list of things that will ruin your day. It's fundamental tothe four-stroke cycle that valves and pistons come close to one another, ...

Let’s say that you’re assembling your next street engine only to discover that the piston-to-valve clearance on the intake side is a little too close for your liking. You could add a thicker head ...