I hate to ruin someone's fun, but I would never put these high compression pistons in an O-235-C model. The high comp. version of the O-235 was the O-235-L and N series and was designed to run the Hi Comp. pistons.
Maybe this advice will keep someone from getting hurt, even though my advice may hurt their feelings a bit.]
Don't worry David, I spent so much time getting the weight down, (I'm not going to stuff up now
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
. The extra GG's were going to cost us .4 kg (1 lb), by the RAA formula (But we won't be going ahead with that now). Plus the blade etc. And I had worked it out, we could also fit the pants and fairings (with hardware etc), and still be just legal
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
.
Bob