Well i have inspected them when i removed the head, i was happy enough to fit them to my car, i owned the whole engine and had it runnung before i removed it, so i never just got them out of some scrap yard. The engine had done 80k, and it had no oil burning issues and had plenty in it when i checked so as far as i no there is no issues of cam wear due to low oil. Thats all i can really say, i could upload some pics next week if you like? Gary