Cylinder Head N/A Big Valve-Ported and Polished

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 5 angle cut and then the valves are lapped.The head is then surfaced to an RA50 finish or better. Finally, the heads are then cleaned and assembled. These heads are designed to be used on the 944 turbo.If you need a head for an N/A application, Please inform at the time of purchase. All of our big valve N/A cylinder heads for the 944 turbo feature the same port and polish,head surfacing,new guides and seals as our standard heads.We also utilize 2mm oversize intake and exhaust valves, stiffer springs and new retainers.In order to use a valve this large,new seats had to be installed on the head. The head and valves are then treated to a 5 angle cut.A big valve head like this is capable of 500+ WHP! 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 then cleaned, assembled and pressure tested.