54530-05HCS Pro Action GM LS3 Rectangle Port Aluminum Cylinder Head - Assembled w/ .660" Lift Springs & Steel Retainers

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Part Number: 4408

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Pro Action™ GM LS3 Rectangle Port Aluminum Cylinder Head - Assembled w/ .660" Lift Springs & Steel Retainers are a premium LS3 replacement head, ensuring great power on any performance or stock engine build.

Pro Action™ GM LS3 Rectangle Port Aluminum Cylinder Heads feature:

Same architecture as factory head - all stock components will fit without issue

Factory correct intake manifold alignment slots avoid power robbing misalignment

Manufactured with premium materials and machined to industry's tightest tolerances

Premium bronze/manganese valve guides for long wear with particular emphasis placed on holding precision tolerances on valve seat concentricity, allowing valve to seal securely for more power

Clean Cast Technology eliminates casting laws and promotes a smoother internal surface finish for greater air and coolant flow

Dual seat spark plug pocket design allows both factory style tapered seat spark plugs and flat seat style plugs in wider heat ranges

.660" Lift springs allow for higher lift cams and increased RPM

Designed for any LS3-style street performance application

“WARNING: This product contains a chemical known to the State of California to cause cancer and/or birth defects

or other reproductive harm. – www.P65Warnings.ca.gov”

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54530-05HCS Pro Action GM LS3 Rectangle Port Aluminum Cylinder Head - Assembled w/ .660" Lift Springs & Steel Retainers

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