Yes but the point here I believe is if you run the lifters with almost no preload even if you over rev the eng the lifters cant pump up enough to hold the valve off its seat. I have seen that a few times over the years on stock type engines. When I worked at a used car dealer I ran a 351 Mustang real hard on a road test and the lifters pumped up enough to hold the valves off the seats and stall the eng. I had to wait a bit before it got comp back. That's why I ran only about .010 preload in my old 383 since I raced it sometimes and used basically the stock valvetrain with Comp single springs. Course to close to no preload and it has more valve train noise. But I understand what you mean also about the spring tension making a difference if you run the normal preload. Ron