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Message: [QUOTE="SFO, post: 159423, member: 21864"] [b]Berylium copper[/b] P.S. What do you think about counter-boring the top of the cylinder to fit a ring of copper-berylium as a heat sink and anti-detonation gaurd? Thats starting to become common on plated NASCAR blocks. I would like to know more about this anti-detonation ring stuff. I first saw it on my friends rs125. He says you have to send it back to the japanese company that installs them for replating. I would be interested in the process of doing it. I think ampco45 would be a better choice than berylium copper. Berylium copper valve seats and valve guides seemed to be more of a mystery metal selling point than anything I have seen proven. The 15% nickel in ampco 45 is tougher than berylium and less toxic to machine. Those Hendricks are on the leading edge as usual... [/QUOTE]