Pieces of steel in cylinder??

Righty Tighty said

I was thinking the same thing. If they did it once, what’s stopping them from doing it again?

So, playing devil’s advocate here. What if the last shop who had hands on it did everything right, and the seat failed from me driving it so hot? The driver side valve seals were all pretty burnt up, and I know for a fact the headers on that side had a leak after I installed them.

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The hardened seats are interference fit... The machinist must get the interference correct or they will not be held in tight enough...

My head guy uses dry ice to cool/shrink the seats before pressing them in.... This helps get the interference fit needed to retain them while reducing the force needed to press them in properly...

Running the engine too hot can loosen the interference fit for the seats and can reduce the interference fit and retention of the seats...