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ATK High Performance 260cc CNC Ported LS3 Aluminum Cylinder Heads HPLS3260
Part Number: HPE-HPLS3260
ATK High Performance 260cc CNC Ported LS3 Aluminum Cylinder Heads
Cylinder Head, 260cc LS3, CNC Ported, 6 Bolt, 70cc Chamber, 260cc Runner, 2.165 in. Intake , 1.600 in. Exhaust, 0.650 in. Max Lift, Chevy, Each
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Estimated Ship Date: Nov 13, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
HPLS3260
Part Type:
Product Line:
Summit Racing Part Number:
HPE-HPLS3260
UPC:
00653517731860
Combustion Chamber Volume (cc):
70
Intake Runner Volume (cc):
260cc
Exhaust Runner Volume (cc):
108cc
Cylinder Head Style:
Assembled
Cylinder Head Material:
Cast aluminum
Camshaft Style:
Hydraulic roller
Intake Port Shape:
Rectangular
Intake Valve Diameter (in.):
2.165 in.
CNC-Machined Combustion Chamber:
Yes
CNC-Machined Intake Runner:
Yes
CNC-Machined Exhaust Runner:
Yes
Combustion Chamber Style:
Heart
Intake Port Location:
Standard
Exhaust Port Shape:
Round
Exhaust Port Location:
Raised
Spark Plug Style:
Angle
Intake Valves Included:
Yes
Exhaust Valves Included:
Yes
Exhaust Valve Diameter (in.):
1.600 in.
Valve Springs Included:
Yes
Maximum Valve Lift (in.):
0.650 in.
Outside Diameter of Outer Spring (in.):
1.304 in.
Damper Spring Included:
No
Number of Springs Per Valve:
Dual
Retainers Included:
Yes
Retainer Material:
Titanium
Locks Included:
Yes
Lock Style:
7 degree
Valve Stem Seals Included:
Yes
Valve Stem Seal Style:
Positive stop
Rocker Arm Studs Included:
No
Rocker Arm Nut Thread Size:
M8 x 1.25
Rocker Arms Included:
No
Rocker Arm Nuts Included:
No
Guideplates Included:
No
Guideplate Pushrod Size:
3/8 in.
Valve Cover Mounting Style:
Centerbolt
Accessory Bolt Holes Drilled:
Yes
Intake Valve Angle:
11
Exhaust Valve Angle:
11
Valve Guides Included:
Yes
Valve Guide Material:
Manganese bronze
Valve Seats Machined:
Yes
Valve Seat Material:
Powdered metal
Cylinder Head Color:
Natural
Finish:
Natural
Steam Holes Drilled:
Yes
Oiling Style:
Through pushrod
Machined for O-Ring:
No
Heat Crossover:
No
Remanufactured:
No
Quantity:
Sold individually.
Notes:
Six bolt cylinder head. Includes rocker stands. Will not fit bore size under 4.000 in. Viton valve stem seals. Exhaust port raised 0.125 in. 14mm x 0.708 in. reach tapered seat spark plug recommended.
ATK High Performance 260cc CNC Ported LS3 Aluminum Cylinder Heads
ATK offers select parts for your build, including cylinder heads. They use them in their engine combinations and are available to complete your LS engine or upgrade existing components.
ATK High Performance 260cc LS3 CNC-ported cylinder head features:
* A356 aluminum construction
* Stainless steel intake and exhaust valves
* Manganese Bronze valve guides
* Viton® valve seal
* Powder meatal valve seats
* Titanium retainers
* Spark plug dimensions: 14mm x .708 in. with tapered seat
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