HPLS3260 Aluminum Cylinder Head for GM Gen III/IV LS Engines, LS3 Rectangle Ports [CNC Ported]

Name: HPLS3260 Aluminum Cylinder Head for GM Gen III/IV LS Engines, LS3 Rectangle Ports [CNC Ported]
Brand: ATK ENGINES
SKU: 059-HPLS3260
Price: 1179.00 USD
Availability: InStock

^$1,179⁰⁰

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GM Gen III/IV LS

Aluminum CNC-Ported Cylinder Head

GM Gen III/IV LS Engines

LS3-Style Rectangle Ports

Combustion Chamber: 70 cc

Intake Valve: 2.165 in.

Exhaust Valve: 1.60 in.

Intake Port: 260 cc

Exhaust Port: Raised .125 in.

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ATK Engines HPLS3260 Aluminum Cylinder Head Specs:

Material: A356 Aluminum
Bolt Count: 6-Bolt Head
Intake Port Volume: 260 cc
Intake Port Dimension: 2.600 in. H x 1.300 in. W
Intake Port Location: Stock LS3 Port
Intake Valve Size: 2.165 in.
Intake Valve Material: Stainless Steel
Exhaust Port Volume: 108 cc
Exhaust Port Dimension: 1.667 in. H x 1.808 in. W
Exhaust Port Location: .125 in. Raised
Exhaust Valve Size: 1.60 in.
Exhaust Valve Material: Stainless Steel
Combustion Chamber Size: 70 cc
Valve Cover Bolt Pattern: Perimeter Bolt
Valve Angle: 11 Degree
Valve Spring Pocket Diameter: 1.610 in. O.D
Valve Spring: Pac 1905 Dual Spring (Hyd. Roller)
Valve Spring Setup Height: 1.800 in.
Valve Spring Closed Pressure: 160 lbs. (w/Retainer)
Valve Spring Open Pressure: 1.200 in. .600 in. Lift 425lbs / 1.150 in. .650 in. Lift 445 lbs. (w/Retainer)
Valve Spring Max Lift: .650 in.
Valve Guide Material: Manganese Bronze
Valve Seal Material: Viton
Valve Seat Material: Powder Metal
Retainer Material: Titanium
Deck Thickness: .750 in.
Minimum Bore Diameter: 4 in.
Flat Mill: .006 in. per cc
Spark Plug Dimensions: 14mm x .708 in. with tapered Seat
Torque Specifications: Based on Factory or Aftermarket Bolts/Studs

ATK Engines HPLS3260 Recommended Components:

Intake Port Gasket: Factory GM
Exhaust Port Gasket: Factory GM
Head Gasket Factory Block: GM 12610046 (sold separately)
Head Gasket Aftermarket Block: 4.125 in. Cometic MLX
Spark Plug Starting Range: NGK TR55 or equivalent (sold separately)
Lifters: .600 in. per applications (lifters w/aftermarket tie bar recommended)
Pushrods: 3/8 in. Pushrods are recommended (must check length)
Rocker Arms: OEM w/upgraded Trunnions or aftermarket

ATK Engines HPLS3260 Flow Data:

Flow Tested on a Super Flow SF600 bench with a 4.030 in. bore size @28 in. water. Clay intake radius was used, Flow tube was not used on the exhaust port.,

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Part TypeCylinder Head

BrandATK ENGINES

Package Height8.1

Package Width10.9

Package Length22.4

Weight26.93 PG

Part CategoryPerformance Parts

Valve Springs IncludedYes

Cylinder Head MaterialAluminum

Rocker Arms IncludedNo

Intake Port Volume (Cc)260