When building an Aircooled motor, one of the most important things is to determine what compression ratio CR you want to build the engine to.
I use a pipette with paraffin
A round disc cut different sizes for
2.4LBore with a hole in the center to fill the head with liquid. Use grease on the edge of the disc to seal and there you go
There after you go to pen and paper
I'll take some pics of actual formulas next
Hope this gives you guys a better idea
How to cc the heads
Vdubtech will also for a small exchange of cash cc your heads for you and help with the calculation
A quick and simple guide on compression ratios when building an engine.
Technical User Guide