The intake ports are ported by a special process that gives an incredible textured finish to help with atomization of the fuel.We have found that by doing this textured finish, we see big gains in horsepower. The exhaust ports on the otherhand are finished to a polished like smoothness to help evacuate the exhaust gases.
Each and every SFR head receives new OEM bronze guides and valve stem seals.The cylinder head is then machined on a Serdi head machine.The seats are given a 3 angle cut and then the valves are lapped.The head is then surfaced to an RA50 finish or better. Finally, the heads are the