b_rubenstein
New Member
With insufficient valve clearance the valves will not fully seat and give a gas tight seal. This results in a loss of engine compression which decreases engine power, and makes it harder to start. This also prevents the valves from properly cooling by transferring heat by conduction into the cylinder head. This is particularly true for the exhaust valves, and if run long enough without being able to fully seat cause the edge if the valve to melt. Even with the NC's very low state of tune, never adjusting the valves over 60k miles would almost certainly damage it.