GMM CNC Ported LS1 (241 casting) Heads - Pair - "Outright"

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Frequently bought together:


1 Pair of Complete GMM CNC Ported LS1 (241 catsing) Heads - "Outright"

What you get

  • CNC ported intake and exhaust port
  • ultra sonic process
  • 16 valves ground
  • 8 intake valve seats turned on Newen cnc cutter Multiple angle variable shape
  • 8 Exhaust valve seats turned on Newen cnc cutter Multiple angle variable shape
  • increased compression ratio with deck face machined. 

If you are looking for that extra edge or, more precisely, added power, then CNC technology will give you the results you need.

In fact, the cylinder head is one of the most, if not the most, important facets of engine horsepower.

GMM Racing Heads have been supplying cylinder heads to major race teams 

They have led the industry by providing superior performance cylinder heads to a broad cross-section of the racing world.

Upgrade Options

Decking: Please choose how much you want decked of the head = $0.00 no extra charge - ( if you are not sure please contact us first)

PSi Valve Springs: Please advise if you would like valve springs added to your order

Valve Stem Seals: Please advise if you would like valve stem seals added to your order

Please note: Expected shipping of CNC Ported heads will be between 2-4 weeks from time of payment received

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