nah its coo. An interference motor is when you dont have piston valve clearance. So if your turning your crank to do the timing DO IT BY HAND so you can stop before you bend a valve. If you are lazy and do it by the starter you will definitely fuck up a valve. Just make sure you turn the crank to top dead center by hand and stop if you feel like the crank doesnt wanna turn anymore because its probably because your hittin a valve. How long has the car been sitting?