[Alan Roehrich]

Total Seal has the spacers with the gas ports. Get them from Keith.

If you get by with less than 10#, that's great, don't get me wrong. I just don't suggest it for everyone, simply because not everyone has available to them everything it takes to make it work consistently and reliably.

If you're running Napier cut second rings and 8# tangential tension oil rings, you're not going to gain much more there.

While good leak down numbers are nice, I've seen some stuff that leaked great and ran like crap, and stuff that ran great and leaked like crap. The key is dynamic seal. How much actual blow by exists in the RPM range between peak torque and 200-400 RPM past peak HP?

If you're going to try to run the really narrow rings, you need to have the pistons built with that in mind, and the clearances set for that as well. Have Keith give your piston manufacturer the ring groove dimensions, and make sure everyone agrees on everything, such as your machinist agreeing on the clearance and the finish.