Rocker arm shelf showed very little where. I do not think there were too many miles on this motor still cross hatches in the Liners. Hairline cracks valve to Valve. The blower is good. other than the liners being a little rusty the block looks like new. so it would be a good rebuilder. There was only one liner that was rusty. It was in a Fire Truck. The air intake was too small was restricted. I am pretty sure It was starved for air. So exhaust temperature in head was pretty hot.