ATK 2CT13S1 LS3/L92 As Cast Cylinder Heads Assembled 255cc



Lead Time: Typically In Stock

SKU: 2CT13S1 Categories: , ,


ATK’s as cast cylinder heads are the perfect budget option for your next LS build. These heads are capable of making over 600HP naturally aspirated out of the box and will come loaded with upgraded components. The springs are setup to be used on up to .650″ lift camshafts. No reason to swap parts on your new heads when running an upgraded cam!

Features & Benefits

-Bronze Valve Guides
-Dual valve springs for .650″ max lift
-CNC finished faces and bolt holes for extreme accuracy
-355-T6 high density aluminum
-Machined for screw in studs and guide plates
-All factory components will fit without modification
-Come fully assembled
-Sold individually


Cylinder Head Specifications

Intake Runner Volume (cc): 252
Intake Port Location: Standard
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.160 in.

Runner Volume (cc): 78.8
Exhaust Valve Diameter (in): 1.600 in.
Exhaust Valves Included: Yes
Exhaust Runner: No
Port Shape: Round
Exhaust Port Location: Standard

Combustion Chamber Volume (cc): 69.4
CNC-Machined Combustion Chamber: No

Intake Valve Angle: 12 Degrees (3 degrees rolled)
Exhaust Valve Angle: 12 Degrees (3 degrees rolled)
Valve Guides Included: Yes
Valve Guide Material: Manganese Bronze
Valve Seats Machined: Yes
Valve Seat Machine Style: 5-Angle
Valve Seat Material: Chrome Nickle
Valve Stem Seals Included: Yes
Valve Stem Seal Style: Viton® Fluoroelastomer

Valve Springs Included: Yes
Maximum Valve Lift (in): .650 in.
Spring Pressure Open: 370 @ 1.150
Spring Pressure Closed: 142 @ 1.800
Outside Diameter of Outer Spring (in): 1.29 in.
Damper Spring Included: Yes
Number of Springs per Valve: Dual
Retainers Included: Yes
Retainer Material: Chromemoly Steel
Locks Included: Yes
Lock Style: 7 Degree

Rocker Arm Studs Included: No
Rocker Arms Included: N/A
Rocker Arm Nut Thread Size (in): 8 x 1.25
Rocker Arm Nuts Included: No

Head Style: Assembled
Cylinder Head Material: Aluminum
Cylinder Head Finish: Natural
Spark Plug Style: Standard
Cover Mounting Style: Standard
Steam Holes Drilled: No
Oiling Style: Through Pushrod
Machined for O-Ring: No
Heat Crossover: No
10mm Accessory Bolt Holes Machined On Ends of Heads


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