I've also heard of a cryogenic procedure performed on all sorts of items WR>> that increases toughness and wear resistance; I wonder if this would work WR>> aluminium cylinder heads... But onto aluminum, you know he might have something here, how about hardcoat, ie thick hard anodize. In the world of rocket science about here every bit of aluminum subjected to wear or intended to resist corrosion recieves such treatment. I'd bet under $100 a head and might make em last forever. Also makes em non-conductive on the surface, ie should not corrode? John
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