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![Cylinder Head for GM LS1, LS2, LS6 Engines [Cathedral Port]](https://www.jegs.com/images/mini_750/500/555/555-514055.jpg)
Vehicle Info NeededJEGSPART NUMBER: 555-514055
Cylinder Head for GM LS1, LS2, LS6 Engines [Cathedral Port]
$69999$755.99You Save$56.00
6 left in stock
Ships on Nov 02, 2026
Lowest Price GuaranteeCathedral Intake Ports
Cathedral Port Cylinder HeadGM LS1, LS2, LS6 4.8L, 5.3L, 6.0L, 6.2L Engines 211 cc Intake Runner 2 in. Intake Valves 1.570 in. Exhaust Valves 69 cc Combustion Chamber Replaces OE Casting Numbers 243, 799 Sold Individually
JEGS 555-514055 Cathedral Port Cylinder Head for GM LS1/LS6 Features:
- Designed for OEM engines
- Utilizes stock valves, retainers, and beehive valve springs
- Designed for center bolt valve covers
- As-Cast Intake Runners, Exhaust Runners, and Combustion Chambers
- Intake Port Dimension: 3.190 in. H x 1.015 in. W x 5/16 in. Top and 3/8 in. Bottom Radius
- Intake Port Location: Stock Cathedral Port
- Exhaust Port Dimension: 1.190 in. H x 1.570 in. W
- Exhaust Port Location: Stock
- Valve Spring Seat Pressure: 76 lbs.
- Open Valve Spring Pressure: 220 lbs.
- Any camshaft upgrade over stock will require valve spring upgrade
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
Fully Assembled to Upgrade Your LS
JEGS LS Aluminum Cylinder Heads are the perfect replacement or upgrade for your LS-based engine. Starting with a new aluminum casting these heads are fully assembled with all new components including intake valves, exhaust valves, valve springs, retainers, guides, and seats. They are available in cathedral port and rectangular port designs to match your GM LS Engine needs.
Part TypeCylinder Head
Product LineJEGS GM LS Aluminum Cylinder Heads
BrandJEGS
Package Height7.1
Package Width10.0
Package Length21.7
Weight26.7 PG
Part CategoryReplacement Parts
Intake Port LocationStandard
Valve Spring Open Pressure220 lbs.
Exhaust Valves IncludedYes
Locks IncludedYes
Engine Make/SizeGM LS1/LS6
Retainers IncludedYes
Intake Port ShapeCathedral
Guideplates IncludedNo
Rocker Arms IncludedNo
Oiling StyleThrough pushrod
Rocker Arm Nuts IncludedNo
Valve Seats MachinedYes
Valve Spring Seat Pressure76 lbs.
Valve Seat MaterialSteel
Heat CrossoverNo
Number Of Springs Per ValveSingle
Valve Springs IncludedYes
Spark Plug StyleAngled
Exhaust Port ShapeD-Port
Damper Spring IncludedNo
Valve Guides IncludedYes
Intake Valves IncludedYes
Cylinder Head TypeCathedral Port
Valve Stem Seals IncludedYes
Intake Valve Diameter2 in (50.8 mm)
Exhaust Port LocationStandard
Valve Guide MaterialPowdered metal
Combustion Chamber Volume (Cc)69
Machined For O-RingNo
Steam Holes DrilledNo
Rocker Arm Studs IncludedNo
Valve Stem Diameter0.313 in (8 mm)
Part FitmentDirect Fit
Valve Cover Mounting StyleCenterbolt
Valve Stem Seal StylePositive stop
Retainer MaterialSteel
Intake Runner Volume (Cc)211
Exhaust Valve Diameter1.57 in (39.878 mm)
Package Qty1
Package TypeEA
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