New block update 3.

[huddy]

Have you ever done a 3-cylinder Zekeley radial? Years ago, a good friend was trying to rebuild one for a 1920's vintage single seat monoplane. He was unable to use the original cylinder heads because the skirts were cracked with missing pieces. He ended up selling all the parts to a local enthusiast who somehow rebuilt it all, but he was unable to fly it (6-7, 260) and couldn't find anyone else who felt brave enough. I've seen it run on the ground & taxi, though.