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CHEVROLET PERFORMANCEPART NUMBER: 809-88958758

LS3 Assembled Cylinder Head, CNC-Ported

Name: LS3 Assembled Cylinder Head, CNC-Ported
Brand: CHEVROLET PERFORMANCE
SKU: 809-88958758
Price: 1064.54 USD
Availability: InStock

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Ships on 11/06/2026

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^$264⁵⁵

555-514050

Cylinder Head for GM LS3 Gen 4 6.2L Engines

^$799⁹⁹

LS3 Aluminum Cylinder Head

CNC-Ported and Assembled
Sold individually, 1/pkg

Assembled Head Components:
Intake Valves - P/N 12569427
Exhaust Valves - P/N 12582719
Valve Springs - P/N 12625033
Valve Locks - P/N 10166345
Valve Spring Retainers - P/N 10166344
Intake Valve Stem Seals - P/N 12482063
Exhaust Valve Stem Seals - P/N 12482062

Features

Manufactured from 319-T5 aluminum alloy
2.165" Hollow Stem Intake Valves
1.590" Solid Stem Exhaust Valves
15 degree valve angle
276cc CNC'd intake ports
92cc CNC'd D-shaped exhaust ports
68.5cc combustion chambers (maintains stock LS3 compression ratio!)
.550" max valve lift with installed springs
Symmetrical intake and exhaust ports
High-efficiency combustion chambers
14mm, 5/8" hex, 3/4" reach, taper-seat Angled spark plug
Bolt-down-type rocker arms
Center-bolt valve cover hold-downs
Design for any LS engine with cylinder bores of 4.000 inches or larger, including 6.2L L92 truck engines
All fasteners are metric
10% increase in airflow over factory LS3 head
JEGS Easy Kits are designed by JEGS Professionals to help you get all the performance parts you need.
LS3 CNC Ported Head Flow Chart
Valve Lift (Inches) Intake Flow (CFM) Exhaust Flow (CFM)
.100 74 89
.200 178 137
.300 237 176
.400 302 228
.500 333 244
.550 348 249
.600 355 253
.700 363 258

Part TypeCylinder Head

Product LineChevrolet Performance LS3 CNC-Ported Aluminum Cylinder Head

BrandCHEVROLET PERFORMANCE

Package Height7.7

Package Width221.7

Package Length510.1

Weight25.44 PG

Retainers IncludedYes

Guideplates IncludedNo

Oiling StyleThrough pushrod

Intake Runner Volume16.8425

Valve Seats MachinedYes

Heat CrossoverNo

Push Rod Diameter9.525

Damper Spring IncludedNo

Valve Stem Seals IncludedYes

Intake Valve Diameter54.991

Valve Angle (Deg)15 deg

Intake Valve Lift (In)2.165

Steam Holes DrilledNo

Rocker Arm Studs IncludedNo

Cnc-Machined Combustion ChamberNo

Exhaust Valve Diameter1.59

Part CategoryPerformance Parts

Cylinder Head MaterialAluminum

Intake Port LocationStandard

Exhaust Valves IncludedYes

Deck Thickness0.4

Locks IncludedYes

Deck Height234.7

Guide Plates IncludedNo

Rocker Arms IncludedNo

Valve Spring Maximum Lift0.55

Rocker Arm Nuts IncludedNo

Cylinder Head FinishNatural

Valve Spring Diameter1.29

Maximum Valve Lift0.55 in (13.97 mm)

Valve Springs IncludedYes

Rocker Arm Stud Diameter0.375

Valve Guides IncludedYes

Cnc-Machined Intake RunnerYes

Intake Valves IncludedYes

Combustion Chamber StyleOpen chamber

QuantitySold individually

MaterialAluminum

Accessory Bolt Holes DrilledYes

Exhaust Runner Volume (Cc)92

Exhaust Port LocationStandard

Combustion Chamber Volume68.5

Combustion Chamber Volume (Cc)68

Machined For O-RingNo

Cylinder Head StyleAssembled

Valve Stem Diameter7.966

Intake Runner Volume (Cc)276

Cnc-Machined Exhaust RunnerYes

Grade TypePerformance

Vendor Part Number88958758

Package Qty1

Package TypeEA

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