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Vehicle Info NeededCHEVROLET PERFORMANCEPART NUMBER: 809-12562917
HT 502 Replacement Cylinder Head Round Intake Port
$1,47477
Ships on 09/14/2026
Lowest Price GuaranteeBig Block Chevrolet Service Replacement Head
- HT 502 Replacement Cylinder Head
- Round Intake Port
- 2.070 Intake Valve
- 1.720 Exhaust Valve
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.
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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 Height9.1
Package Width221.7
Package Length510.1
Weight82.99 PG
Part CategoryPerformance Parts
Valve Stem Diameter (Mm)9.51
Casting Number12562932
Plug TypeStd
Deck Thickness9.525
Rocker Stud Diameter (In)0.438
Deck Height9.8
Port TypeRound
Guide Plates IncludedNo
Valve Spring Maximum Lift14.224
Intake Runner Volume18
Valve Spring Diameter38.125
Push Rod Diameter9.525
Valve Stem Diameter (In)0.374
Head Casting Number12562932
MaterialIron
Intake Valve Diameter52.578
Valve Angle (Deg)BBC
Combustion Chamber Volume118
Rocker Stud Diameter (Mm)11.113
Intake Valve Lift (In)2.07
Part FitmentSemi Universal
Intake Runner Volume (Cc)-
Grade TypePerformance
Exhaust Valve Diameter1.72
Vendor Part Number12562917
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
