i purchased one of the open tansfer cylinders using on the latest rebuild of my OCC, running it on a (zeda) triple 40 bottom end. still in the break in period but im quite happy with it. The chrome in it is very nice uniform no spalling etc. it has fairly large ports stock. Setup with a single base gasket its got the best port timing ive seen without porting, the exhaust port timing is all but perfect and it took a very minimal skirt adjustment for a fully open intake. I like the design. the middle rail should keep the rings in place fine and there has to be a certain amount of friction reduction, the motor is real rappy. time will tell...... kelly