Patriot Performance 227cc LS

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Patriot Performance 227cc LS CNC Ported LQ9 Heads Assembled #2019 Patriot 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 65 cfm improvement over stock OEM versions. The 72cc chambers are great for lowering compression for applications where a power adder will be used. The Stage III heads feature 21-4N 2.08”/1.60” stainless steel valves, 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: 72cc 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 Cost: $1,295

Promar Reserves the right to change manufacturers and specs without notice. HP and TQ ratings are based on actual results on a engine dyno with open headers in controlled environment tuned for maximum performance.