I would consider checking the valve clearances yourself if the mechanic has not checked them. Just because it should be done every 15 k and with labour rates being what they are today for starters. Also it is a pretty easy thing to do really and very hard to go wrong if you follow posted instructions. For right now you have to basically just check #5 to make sure there is some clearance. If you are in a position where you have to pay others to do everything on these cars for you they can be a moneypit. On the otherhand they are one of the few cars left out there where the owner can learn and accomplish things himself. The support available from this site makes the situation bearable and improves both your ability and judgement.