They all look pretty normal. I can't see anything on top of the head that looks out of place. Thanks for the idea though.Crazy idea, what if one of the valves springs broke? And valve just stays open? Have you had a good visual around all 4 valves springs?
That would make it a lot easier! I didn't know there were bolts there. Thanks!Can you not leave the manifold on and undo the 3 or 4 bolts on the bottom of the cat. Once the heads off you can work on it then.