Capt’n, the blower engine was the first one I have cut in over 20 years and only the exhaust port was modified. The cylinder cut easily with a tile bit in the dremel tool. I finger sandpaper to break the port edges. I also made a pencil trace of the original port so the shape could be maintained. Target was 150* but calculations must have been off so I ended up with155* duration. As with other operations go slow. It is easy to take too much material off.

Suspect chrome is impregnated today rather than plated and it did not appear to be a problem.

Bill