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Vehicle Info NeededCHEVROLET PERFORMANCEPART NUMBER: 809-12562920
Gen V & VI Service Replacement Head Complete Assembly 3/8"
$1,39416
Ships on 09/11/2026
Lowest Price GuaranteeBig Block Chevrolet Service Replacement Head
- Gen V & VI Service Replacement Head
- Complete Assembly
- 7/16'' Accessory Bolt Holes
NOTE: - Will not work on L29 enginesTechnical Specifications:
- Intake valves: 14097045
- Exhaust valves: 14097049
- Valve Springs: 14097002
- Retainers & Seal Kit: 12360874
- Keepers: 3947880
- Valve Spring Shim: 3875916
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
The Chevrolet Performance service replacement cylinder heads are direct replacements on most 1990-and-later GM Big-Block 454-cubic-inch and 502-cubic-inch engines. These brand-new cylinder heads meet GM's stringent quality standards and provide excellent service and durability not found in used cylinder heads!
Technical Notes:
- Cast-Iron or Aluminum
- 325cc Rectangular Intake Ports
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- 118cc combustion Chamber
- Machined for 2.180"/1.880" (3/8" stems) Valves
- Non-Adjustable Rocker Arm Design
- Heat Risers
- Will not work on Production Mark IV Blocks
- Sold Individually
Part TypeCylinder Head
Product LineChevrolet Performance Big Block Chevy Service Replacement Cylinder Heads
BrandCHEVROLET PERFORMANCE
Package Height8.3
Package Width221.7
Package Length510.1
Weight76.45 PG
Retainers IncludedYes
Guideplates IncludedNo
Oiling StyleThrough pushrod
Intake Runner Volume18
Valve Seats MachinedYes
Heat CrossoverNo
Number Of Springs Per ValveSingle
Push Rod Diameter0.375
Damper Spring IncludedNo
Head Casting Number12562934
Valve Stem Seals IncludedYes
Intake Valve Diameter2.18 in (55.372 mm)
Valve Guide MaterialBronze
Outside Diameter Of Outer Spring1.487 in (37.8 mm)
Steam Holes DrilledNo
Rocker Arm Studs IncludedNo
Retainer MaterialSteel
Cnc-Machined Combustion ChamberNo
Exhaust Valve Diameter47.752
Part CategoryPerformance Parts
Cylinder Head MaterialCast iron
Casting Number12562934
Plug TypeStd
Intake Port LocationStandard
Exhaust Valves IncludedYes
Deck Thickness9.525
Locks IncludedYes
Deck Height248.92
Lock Style10 degree
Guide Plates IncludedYes
Rocker Arms IncludedNo
Valve Spring Maximum Lift0.56
Rocker Arm Nuts IncludedNo
Cylinder Head FinishNatural
Valve Spring Diameter1.55
Maximum Valve Lift0.6 in (15.24 mm)
Valve Seat MaterialSteel
Valve Springs IncludedYes
Rocker Arm Stud Diameter0.438
Valve Guides IncludedYes
Cnc-Machined Intake RunnerNo
Intake Valves IncludedYes
Combustion Chamber StyleOpen chamber
QuantitySold individually
MaterialIron
Accessory Bolt Holes DrilledYes
Exhaust Runner Volume (Cc)110
Exhaust Port LocationStandard
Combustion Chamber Volume7
Combustion Chamber Volume (Cc)118
Machined For O-RingNo
Cylinder Head StyleAssembled
Valve Stem Diameter0.371
Part FitmentSemi Universal
Valve Cover Mounting StyleCenter and perimeter bolt
Valve Stem Seal StylePositive stop
Intake Runner Volume (Cc)325
Cnc-Machined Exhaust RunnerNo
Grade TypePerformance
Vendor Part Number12562920
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
