Jeff ... I am sure that you are correct on the shape of the combustion chamber. I just didn't see an "easy" way to lower the compression and keep everything in balance. Deeping the dish was my first thought but after talking it over with the machine shop guy, I agreeded that a flat top would be the most consistant between the four pistons.

On building engines, my fun was getting the supercharger stuffed in and working through the "sorting out" process. I gave up on CIS and instaled a digital engine management system that provides all of the control and flexibility to keep the process interesting. Changing pistons is just WORK.

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Jim Villers
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"