I have a head that has .125 off, and doesn't look like that. Also a head that has 39 cc chambers, that doesn't look like that.
You can get a pretty good idea of how much the head has been milled, by measuring the thickness of the head from the deck surface to the valve cover surface. The "nominal" stock dimension is 3.600 inches.
As for Quench, I spoke to a company at the PRI show, that can weld up the compustion chambers, and remachine them, to give quench, and/or a high swirl confiuration. They gave me an estimate of $100 per chamber. The thing to consider with modifing the chamber, is how it would effect air flow. It might help, or it could hurt. Would need to be checked on a flow bench. I was think of sending them a single cyl section of a head, to try, and work on the port flow. Never did as I could afford to do one cylinder, but not a complete head.
