I have these drag ported cylinders from Dirtworx Racing for sale...They came off a running bike, I just recently went to a ported cub....these are bored 40 over and come with the (65mm) wiseco 513 series pistons, clips, wrist pins, and bearings as well....If you have any questions about them call Brent at Dirtworx at 380-384-4181, and let him know these are "D. Stacks" old cylinders and he can tell you all about the costly porting in which was done....these are ready to bolt on and race....these have the similar intake ports as a cheetah cub cylinder....they will produce easily in the mid 80's as far as HP's with the right setup
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