Quote: How come the one to the right looks fine and the two broken ones are mangled? I'd figure that the one to the right would be showing some signs of abuse even if it isn't busted off? All valve springs and keepers are the same (or should be).
Tight valve clearances cause the valve to stick and then the piston hits the valve and bends it. Never heard of a sticky valve causing the top of a guide to shear clean off like that.
If he didn't check guide clearance he not likely checked installed height either. If the spring pressures are different valve to valve, some will float before others which could explain this carnage. A simple disassemble and inspect which should be done to ANY parts before use could have prevented this.
