Cheetah
The Cheetah series High Performance monoblock cylinders developed by Calvin Pollet 
took the R5/RD/RZ/TZ/Banshee series engine family to the next logical level combining 
everything that had been learned.A Monoblock cylinder so that the transfer port tunnels 
at the center of the engine could be made larger, Abridged intake so that the engine 
wouldn't swallow it's own pistons, 6 transfer ports and dual boost ports to increase velocity 
and volume, and triple exhaust ports to give the engine the exhaust area it really needs.