But obviously it's not as cheap as not doing it and hoping it never will. It's much cheaper to do it before they break, than after. If you were buying a Hemi to keep for a long long time and wanted to mitigate against this happening, the only sure way is to have the heads sorted before they break, or buy a spare pair of heads and have those sorted and fitted, then sell your old pair. The general feeling is that the valve seats are coming loose due to overheating issues. Benny has got away relatively lightly by the sound of it, but at least he knows it won't happen again! The valve will then not close properly and all sorts of mayhem can ensue - if the valve head breaks off and falls into the combustion chamber it can shatter the piston, which in turn will allow the rod to come out of the side of the block. What is happening on these engines is that the insert is coming loose and out of place. It is a hardened piece which the valve closes against, rather than the valve closing against the relatively soft metal of the head itself. I don't quite know what that means apart from hearing it on this car but what's the cost to rebuild/repair? That metal ring you can see in the bottom picture hanging off the back of the valve should be firmly affixed to the cylinder head! That is the valve seat or insert.
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