Thanks for the heads up. I went over there and was reading everything. Seems someone is really interested in upping the compression ratio of these motors. No real way to do that. Pistons already come up out of the block around 45 to 50 thousands. Then somebody has a thought that the precup needs to have a bigger port in it. Its a thought but the design is for turbulance of the flame and fuel front. I did open up the first set on my rebuild but it burned down so I'm not sure it did any good. I made them about .400 by .600 and took out the lip inside of the precup. I don't feel this did any good for fuel and flame action thru the port. I did machine the chambers 0.060 into the heads and bored them out to 1.168 with a custom ball end mill I had made up. That really balanced all the cylinders and the precup volume was about 20.4 cc.
