Patriot Performance Freedom Series heads have started a revolution in the performance world. Patriot has custom designed a head to meet the demands of the BBC world, while keeping the quality high and the price reasonable. Their BB-Chevy heads come as cast with a 320cc intake runner, US made bronze guides, and our 5 angle valve job. Chevy High Performance used these to build their 675 hp 496 in their Jan. 2008 issue. These heads come standard with a 119cc chamber, assembled in their facility with 21-4N stainless valves, several spring choices, steel or Ti retainers, 7/16'' studs, guide plates, and viton seals.
Sold as Pair



Technical Specs:
Combustion Chamber: 119cc
Intake Runner: 320cc
Exhaust Runner: 125cc
Intake Valve: 2.250'' or 2.300''
Exhaust Valve: 1.880''
Max. Valve Spring Lift: 0.700''
Spring Pressure Closed: (723-2211) 135 lbs. @ 2.00''; (723-2214) 220 lbs. @ 2.00''; (723-2216) 325 lbs. @ 2.100''
Spring Pressure Open: (723-2211) 365 lbs. @ 1.400''; (723-2214) 600 lbs. @ 1.300''; (723-2216) 800 lbs. @ 1.300''
Retainer Material: Steel or Ti
Valve Seal Material: Viton
Valve Guide Material: Manganese Bronze
Valve Job: 5-angle