Pull the valve back while pressurizing (be the spring). If the valve does not seal under pressure it's very likely damaged. If you put the motor back together and run it you stand a good chance of dropping the valve. As you have a very understanding customer, that may be an ok gamble for you, because there is a chance it could be fine. It really depends on your level of risk acceptance. Me? If the valve did not seal perfectly I'd drop the head. listening to the motor crump after all that work would be just too painful. Keep us posted
