racervette69
Underachiever
Stock engine, stock cam. stock rockers, springs. Was running fine. Exhaust valve tips only. Heat? Everything else in the engine looked good with very little wear.
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is the area worn to a dimple? That would explain the excessive loading on the tips edge and cause chunks to chip off. Replace all valves and rockers. Weird that it's only the exhausts, maybe a set of worn guides giving poor heat transfer and a hot running valve? Won't know till you take it all off.
how are you going to replace the valves otherwise?
No blue or sign of overheating. I have decided they are just worn out and the extra heat of the exhaust valves may had added to the wear???
No blue or sign of overheating. I have decided they are just worn out and the extra heat of the exhaust valves may had added to the wear???
The force to open the exhaust valve is greater than that to open the intake valve because of high pressure in the cylinder at time of exhaust opening.