Pro Action GM LS3 Rectangle Port Aluminum Cylinder Head - Bare

Pro Action™ Rectangle Port Aluminum Cylinder Heads are a premium LS3 replacement head, ensuring great power on any performance or stock engine build. 

In stock

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
  • Designed for any LS3-style street performance application