I am really considering going with custom pistons now. I feel confident the 560 pistons would work but with no concrete evidence I don't want to risk it. Custom pistons will allow me to use a small dish volume so I can raise my CR. I will start a new thread to get ideas.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT