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Vehicle Info NeededPROMAXX PERFORMANCEPART NUMBER: 723-2210
320 Series Aluminum Cylinder Heads Big Block Chevy
$1,61225
Ships on 09/21/2026
Lowest Price Guarantee320 Series Aluminum Cylinder Heads320cc Intake Port Volume
- 320 Series Aluminum Cylinder Heads
- Big Block Chevy
- As-Cast
- 320cc Intake Ports
- 119cc Combustion Chamber
- 2.30'' Intake / 1.88'' Exhaust Valve Sizes
- Bare, 2/pkg
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
- 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
Part TypeCylinder Head
Product LinePatriot Performance BB-Chevy Freedom Series Heads
BrandPROMAXX PERFORMANCE
Package Height11.0
Package Width15.2
Package Length27.2
Weight74.1 PG
Part CategoryPerformance Parts
Cylinder Head MaterialAluminum
Intake Port LocationStandard
Exhaust Valves IncludedNo
Locks IncludedNo
Retainers IncludedNo
Guideplates IncludedNo
Rocker Arms IncludedNo
Oiling StyleThrough pushrod
Rocker Arm Nuts IncludedNo
Cylinder Head FinishNatural
Valve Seats MachinedYes
Valve Seat MaterialDuctile iron
Heat CrossoverNo
Valve Springs IncludedNo
Valve Seat Machine Style5-angle
Damper Spring IncludedNo
Valve Guides IncludedYes
Cnc-Machined Intake RunnerNo
Intake Valves IncludedNo
QuantitySold as a pair
Valve Stem Seals IncludedNo
Intake Valve Diameter2.25 in (57.15 mm)
Accessory Bolt Holes DrilledYes
Exhaust Port LocationStandard
Valve Guide MaterialManganese bronze
Combustion Chamber Volume (Cc)119
Machined For O-RingNo
Steam Holes DrilledNo
Rocker Arm Studs IncludedNo
Cylinder Head StyleBare
Part FitmentSemi Universal
Valve Cover Mounting StylePerimeter bolt
Intake Runner Volume (Cc)320
Cnc-Machined Exhaust RunnerNo
Cnc-Machined Combustion ChamberNo
Exhaust Valve Diameter1.88 in (47.752 mm)
Vendor Part Number2210
Package Qty1
Package TypeEA
No Questions
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Some parts are not legal for use in California or other states with similar laws / regulations
