OK, I butchered up two rotor housings. These are straight out of the shop. All the clean up and porting is still ahead of me. The PP ports are 1.25 inches and the exhaust ports are 1.5 inches machined as round holes. So now I can grind any kind of exhaust port I fancy. Just don't know what to port exactly. I wanted a constant diameter from the combustion chamber to the manifold flange. I am not worried about the exhaust reversion like some people. I believe our engines don't produce much of a pulse.

I could use some input on port size, shape and exhaust runner diameter. I intend to use the side ports. Secondary is a decent size street port and primary is just cleaned up.

CW