I had time today to make some sample chambers from my 3D model. I went ahead and made a left and right chamber. I'll pick up some valve seats and machine and install them into these. I almost have the exhaust port finished modeling up, then I can add it to the chamber model below and start on the intake port. I'm creating this as a modular assembly so I can isolate and remove select features without having to redo the entire part. Once completed I can flow it for further evaluation, and begin making my core patterns once i'm satisfied they meet my projected goal. If nothing else, they'll make some cool looking ashtrays!