Yeah I think he explained that all through the video that this was just do it yourself kind of check. We all know you're a badass machinist and check everything down to its last nuance but this isn't what this is about... no one's trying to set the world on fire with a set of Speedmaster heads.. and when you're going for Budget why spend trick flow money on them? No one is recommending these heads for an extreme all-out effort.. I don't think anyone's putting them on a high-mileage car that they're going to put twelve thousand miles a year on... At $700 a set you could probably buy a new set every four-five years and not have a problem LOL just put ten bucks away a month...