I have a 94 honda accord vtec with a bad exhaust valve. The car is mint and the motor runs strong except for the valve which causes it to run a little rough. It isn't my main vehicle but I'd still like to take care of the problem. I want to pull the head and have it reconditioned but an issue is the motor has 170k on it. I'm thinking a new head will cause the engine to smoke like hell. any ideas? thanks