GM Heads

The RLD Performance GEN III and IV LS7, LS3, L92, LS2, LS6, and LS1 racing cylinder heads and components are some of the most highly developed parts in the industry.  None of the LSX intake ports flow under 300 CFM.  This  covers all venues.  A full line of late model cylinder heads are available with specified valve train components by application.  We are stocking our GM GEN III/IV valve train upgrade kits which, we feel, are the finest available.  Custom camshaft designs are available for maximum performance.   

CNC machining of factory cylinder heads - We are starting with a developed "as cast port" product from the factory.  The factory castings have thin walls in certain places so we have developed the ports around the factory limitations quite effectively.  Once a model port is finished, the port is digitized for replication.  GM Canadian die cast cylinder heads are more accurate and tend to have more material present than GM Mexican sand castings, which are less accurate, and tend to vary significantly from lot to lot.  As CNC machining is based on a model port and the factory castings can vary, shadowing can occur in the port.  In other words, the simultaneous 5-axis machine cuts the intended port machining path.  If no material is present, the machine cuts air and a dark spot is left behind in a low spot where no material existed.  This is usually cosmetic only and has little effect on the cylinder head air flow and or performance.  Also, this will make the port volume slightly larger than intended.

Our ports out flow all of the GM CNC ports as well as most aftermarket offerings.  Be cautious of industry "Budget" priced cylinder heads or competitors who do not post flow numbers.  We believe that you get what you pay for.   Please compare flow data.  Flow data is designed for a straight across direct comparison.  We chose to design the ports around smaller valves and runner sizes creating a higher velocity port as well as a balanced port with not necessarily the highest peak flow but the highest average flow to .700 lift.  This is the key to making power and a broad torque curve with less low speed torque loss on the street.

 RLD Performance, P.O. Box 890066, Temecula, CA 92589 (951) 676-4948, 9am-5pm Pacific Standard Time M-F, stan@rldperformance.com