Small Block Chevy 23-degree cast iron head that is CNC-ported from the factory.
Engineers at RHS™ have recently designed the only Small Block Chevy 23-degree cast iron head that is CNC-ported from the factory. The precision accuracy and durability of the RHS™ Pro Elite™ SBC 23° CNC-Ported Iron Cylinder Heads are derived not only from the precision CNC-porting of the intake and exhaust runners but the CNC-ported combustion chamber, as well.
The CNC-ported 228cc intake and 82cc exhaust runners optimize volume, atomization and velocity while the 69cc combustion chambers are CNC-ported to relieve valve shrouding that occurs in “as cast” chambers when the edge of a valve is in close proximity to the combustion chamber wall. By CNC-machining the combustion chamber, RHS™ was able to improve the airflow efficiency of the cylinder heads.
• SBC 23° iron cylinder heads for iron-mandated circle track and drag racing
• CNC-ported 228cc intake and 82cc exhaust runners
• 2.055" multi-angle intake and 1.600" radius exhaust seats
• CNC-ported 69cc combustion chamber relieves valve shrouding and improves airflow efficiency