RHS® Pro Action™ Rectangle Port Aluminum Cylinder Heads for GM LS3 Applications

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Memphis, TN – RHS® introduces its new Pro Action™ Rectangle Port Aluminum Cylinder Heads as a premium LS3 replacement head, ensuring great power on any performance or stock engine build.

Available bare or assembled with premium COMP Cams® valve train components, these LS3 heads are engineered with the same architecture as the factory head, and all stock components will fit without issue. The RHS® Pro Action™ LS3 Heads also feature factory correct intake manifold alignment slots to ensure that intake manifold ports line up properly with the cylinder head ports to avoid power robbing misalignment. The assembled versions feature either dual or Beehive™ Valve Springs, chromemoly steel retainers, heavy-duty stainless steel valves and top-quality valve seals – all inspected and assembled by qualified RHS® performance technicians. The Beehive™ Valve Springs allow up to .570” lift cams while the dual spring option is good up to .660” lift, therefore increasing RPM over stock springs.

RHS® Pro Action™ Rectangle Port Aluminum Cylinder Heads for GM LS3 are manufactured with premium materials and machined to the industry’s tightest tolerances. They feature premium bronze/manganese valve guides for long wear with particular emphasis placed on holding precision tolerances on valve seat concentricity, allowing the valves to seal securely for more power. 

All RHS® cylinder heads feature patented Clean Cast Technology™, a revolutionary process that eliminates casting flaws and promotes a smoother internal surface finish for greater air and coolant flow. These benefits provide more power and cooling, right out of the box. A unique dual seat spark plug pocket design allows you to use both the factory style tapered seat spark plugs and also flat seat style plugs that are available in wider heat ranges for high performance applications. 

RHS® Pro Action™ Rectangle Port Aluminum Cylinder Heads for GM LS3 are designed for any LS3-style street performance application and offer one of the best performance values for aftermarket LS3 heads.*

*Require minimum bore of 4.000”

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RHS LS3 Cyl. Head Chart-2

About RHS®

Founded in 1967, Racing Head Service® began exclusively as a manufacturer of racing cylinder heads. Over the years, RHS® grew into an integrated racing company, offering complete turn-key engines and race car parts via mail order. With innovative cylinder head designs and porting techniques, the company became a performance icon in both circle track and drag racing.

RHS® is now a proud member of the COMP Performance Group™ with the industry’s largest and most advanced airflow technology team that produces both aftermarket cylinder heads and engine blocks. For more information about RHS® and its products, visit us online at www.racingheadservice.com or call us at 1.877.776.4323.

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