Engineers at RHS® have recently designed the only Small Block Chevy 23-degree cast iron head for 360-434c.i. engines that is CNC-ported from the factory. The precision accuracy and durability of the RHS® Pro Elite™ SBC 23-Degree CNC-Ported Iron Cylinder Heads are derived not only from the CNC-porting of the intake and exhaust runners but the CNC-ported combustion chamber, as well. 

The CNC-ported 240cc intake and 85cc exhaust runners optimize airflow volume and velocity while the 53cc combustion chambers are also CNC-machined to relieve the valve shrouding that occurs when the edge of a valve is in close proximity to the combustion chamber wall. Overall, the full CNC-porting process provides more consistent runners and smoother port-to-chamber transitions, thereby increasing both airflow efficiency and horsepower. In addition, these new heads from RHS® are designed to use offset rockers in order to maximize the intake window at the pushrod opening for increased airflow.

As with the rest of the Pro Elite™ family, these SBC iron heads come with a host of unique features, including premium bronze valve guides and a multi-angle valve job. Also, ductile iron valve seats are inserted to better prevent seat and guide wear with alcohol and other racing fuel applications. The ductile iron 2.100" multi-angle intake and 1.625" radiused exhaust valve seats allow for superior airflow and improved atomization with racing fuels. In addition, the heads feature a refined water jacket for more even water flow to reduce hot spots in the engine. For racing classes that mandate the use of cast iron cylinder heads, RHS® has designed the ultimate advantage by utilizing the latest in airflow technology.

For more information about the RHS® Pro Elite™ SBC 23-Degree CNC-Ported Cylinder Heads or any other RHS® product, call 1-877-776-4323, or go to www.racingheadservice.com.