Quote:
Originally Posted by Pete
Knurling DECREASES the area of the guide in contact with the block. This slows heat dissipation from the valve. A bad thing.
Copper plating INCREASES the contact area to the block and along with superior heat transfer properties speeds the heat transfer away from the valve. A good thing.
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I only do this on the intake side - not the exhaust. Copper plating makes sense - just need to find a local place to do it for a fair price. About the only places I know are a couple chrome platers . . . might have to check it out with them.