Ok now I realized it. Of course overlap occurs when the piston is up on the exhaust stroke.

I doubt there is much room to increase lift at this point in the cycle though. There is just not much room in the combustion chamber to work with.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.