What a bummer. My 2001 426 was making a noise I was not familiar with so I figured it was time for a valve check. It might have had 10 hours on it since it was rebuilt by a dealer mechanic because of timing chain breakage. The intake valves were so tight I could not get any feeler gauges in to check clearance. So I took the chain off and the intake cam wouldent even spin. The bolts to the cam cap seemed really tight, but its hard to tell with a short wrench. After I pryed the cam out of the cap I discovered the cap and head are egged out.The bearing is fine. The head journals are so mushroomed that I cant remove the buckets from the springs. What could have went wrong? The oil is changed every ride faithfully. There was oil in the cam cap, so I assume its getting oil and the exhaust cam is fine and that is lubbed after the intake cam. What else should I check? I'm worried about the valves, and my wallet.