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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 68cc 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: 68cc
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
Price: $1,295.00
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