Street Heads. Designed to provide good air flow for street cars using a slightly modified port design that offers more strength between the spark plug hole and valve seats. Standard valves, 2.400 intake and 1.940 exhaust. Balanced bowls back cut SS Ferrea racing valves, CHE hardened valve seats and HP valve guides. Standard clearance for 700 lift cams. Flow 355 CFM with no porting or polishing out of the box.

Heavy Street/Competition Heads. Larger port Ferrea valves, CHE seats and guides, CNC machine ported. Flow 450 CFM out of the box. 2.400 intake and 1.940 exhaust.

Full Competition Heads. Large intake valve option increased to 2.600 intake, 3 degree angle, 1.940 exhaust, CNC Polished and slightly raised port ready to install out of the box. Flow 500 CFM.