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Does anyone know what it cost to harden the valve seats.
you don't harden them, you replace them.
First, you use a giant cutter to cut the seat area out of the head, then you drive in a new hardened seat. Not a tough job, but needs to be precise.

Really only needs to be done if your existing seats are badly worn or recessed.
The unleaded gas / hardened seat thing is mostly an old wives tale.
 
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