Pro Action GM LS3 Rectangle Port Aluminum Cylinder Head - Assembled w/ .660" Lift Springs & Steel Retainers
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.
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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/managnese valve guies for long wear with particular emphasis placed on holding precision tolerances on valve seat concentricity, allowing valve to seal secruely 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 pluggs in wider heat ranges
- .660" Lift springs allow for higher lift cams and increased RPM
- Designed for any LS3-style street performance application