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The bigger the number the bigger the opening and more taper in the runner from the opening to the cylinder head flange
Ross and others
Designed to fit GM LS7 port openings
625" Exhaust Valves flowing over 280 CFM
Fuel Rail Extrusion -12 AN
CID SC2 SB Ford Cylinder Heads Big Block Chevy cylinder heads The bigger the number theOur succesful Canted Valve SC2 SB Ford Cylinder Heads developed in conjunction with BES Racing Engines have redefined small block cylinder head performance. These castings represent the pinnacle of cast Small Block Cylinder Head Performance. The optimized valve train layout will accept up to a 2. 300" Intake valve approaching 500 CFM, combined with a 1. 65" exhaust exceeding 300 CFM on a 4. 185" bore, and will also fit smaller bores down to 4. 125
US$ 59.95
US$ 53.95
US$ 40.95