MALS is considering a simple way to check engine compression ratios without pulling the head. Anyone have a system that is usable? We have found charts with factory cc's listed and have possibly figured a way to inject premeasured amounts Marvel Mystery Oil in through the plug while at TDC. Then extract the biggest part before replacing the plugs and creating a "hydraulic" situation. A minute amount of MMO shouldn't harm a motor when refired. Questions are..........Do they consider cc with the spark plug in place? How much would .005-.010 in head milling effect the stock cc? Has anyone considered this as a viable way to check compression ratios? Obviously this would be done AFTER bore and stroke have been verified. If someone could call me or email be with some input, I would really appreciate it. We are experimenting to see if we can use this as part of our tech system. Thanks in advance........Phil Heavelow (913) 371-5152 or jmillwright@kc.rr.com