Twin Cam Hop-Up
2. Notice the stock head on the left compared to the Branch-O'Keefe head on the right. The Branch head has been fitted with oversize valve seats made from nickel-chrome, and performance valve guides. Then they are ported to accept the larger hard chrome stainless steel valves with stellite tips and a polished face (new intake valve is 1.940 inches, new exhaust valve is 1.610 inches; stock intake valve is 1.840 inches, stock exhaust valve is 1.565 inches). The valves and combustion chamber have a polished surface to help enable more air/fuel flow and increase velocity.
View Related Article
|
|