Thanks Guys! Big Thanks to Aaron for letting me borrow his engine and props.
The CMB seems to be a great engine, I made 11 passes and never took a plug out and when the engine was checked it looked perfect no hot spots.
I was running 65% nitro with 12% Klotzs, Odonnell OD9 plug, AB 45 nitro pipe at 8 inches and a Steve Sutton 2160 prop with 5.4 pitch 58 mm to set the record.
Switched to Aarons largest prop went 114.7 no problem. I was having a problem turning the boat around added more rudder throw. This solved the problem.
However; It was getting dark and the wind blew the next 2 days. Always next time...I hope.