Pro Elite GM LS3 CNC-Port 6-Bolt Aluminum Cylinder Head - Assembled w/ .700" Lift Springs & Stainless Int./Inconel Exh. Valves

  • Pro Elite™ CNC-Port 6-Bolt LS3 Cylinder Heads are ideal for high horsepower and boosted LS3 builds and use the popular 6-bolt design. Assembled head includes: #54550 Cylinder head, #943 dual valve springs, #1731 tool steel retainers,#632 valve locks, #511 valve seals, #4874 spring seats, #6081 stainless steel intake valves, #6084 Inconel exhaust valves
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Pro Elite#153 CNC-Port 6-Bolt Cylinder Heads for GM LS3 Engines utilize the popular LS 6-bolt head design, making them compatible with the RHS® LS Race Block, GM LSX Block and OEM 4-bolt blocks. The 6-bolt design offers increased clamping capacity over the standard factory 4-bolt configuration and greatly improves head gasket retention, ideal for boosted and high compression engines. Features include an 11° valve angle and fully CNC-machined ports for improved airflow. The CNC-machined runners and chambers, as well as the rolled valve angle, increase overall flow capability, while an improved water jacket design improves thermal conductivity. The premium .500” bronze valve guides withstand long wear with particular emphasis placed on holding precision tolerances on valve seat concentricity, allowing the valves to seal securely for more power. Finally, the .700” thick deck and reinforced rocker rails make these cylinder heads ideal for high horsepower and boosted LS3 applications. Features .700” lift dual valve springs, tool steel retainers, stainless steel intake/Inconel exhaust valves and valve seals – all inspected and assembled by qualified technicians. 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.