Patriot Performance CNC Ported 243 LS6 / LS2 2.08"/1.60" 64cc Heads Assembled

Our custom 5 axis CNC machined new GM castings make these heads a must have for any performance oriented GM LS series engine. These heads provide up to a 80 cfm improvement over stock OEM versions. The 64cc chambers are a great choice for 4.00” and larger bore motors. These will work on both naturally aspirated and applications where forced induction or nitrous will be used. The Stage III heads feature 21-4N 2.08”/1.60” stainless steel valves, our Original Patriot Gold Dual .650” Lift springs, titanium retainers, Super 7 machined locks, custom honed bronze guides, machined spring bases, and viton rubber seals.

*Sold as Pair

Technical Specs:

• Combustion Chamber: 64cc
• Intake Runner: 227cc
• Exhaust Runner: 70cc
• Intake Valve: 2.08"
• Exhaust Valve: 1.60"
• Max. Valve Spring Lift: 0.650"
• Spring Pressure Closed: 135 lbs. @ 1.800"
• Spring Pressure Open: 375 lbs. @ 1.090"
• Retainer Material: Titanium
• Valve Seal Material: Viton
• Valve Guide Material: Manganese Bronze
• Valve Job: 5-angle