Reply To: Cracked valve seats

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Jim,
I totally agree with your points. A significant, and somewhat overlooked function of exhaust valves is to carry the heat from the seat in the block and down the stem for cooling. I’ve seen some of the "new" stainless valves hogged from stainless barstock and I think that these can contribute to the block cracks which some people have seen when driving the engines hot and hard.

Greg