Description

Rectangular port, LS3 11 aluminum cylinder heads deliver exceptional air flow to large cubic inch LS-based racing engines. Heads include 273cc intake runners, are fully CNC-ported and designed for applications with a minimum 4.000″ bore size. Offered as bare or fully assembled with 2.165″ intake and 1.600″ exhaust valves, titanium retainers and PAC valve springs. Heads use OEM-style rocker arms and require FED913001 billet rocker stands.
Cylinder Head Style:
Assembled
Cylinder Head Material:
Cast aluminum
Cylinder Head Finish:
Natural
CNC-Machined Combustion Chamber:
Yes
Combustion Chamber Volume (cc):
71cc
Combustion Chamber Style:
Heart
CNC-Machined Intake Runner:
Yes
Intake Runner Volume (cc):
273
Intake Port Shape:
Rectangular
Intake Port Location:
Standard
Intake Valve Angle:
11 degree
CNC-Machined Exhaust Runner:
Yes
Exhaust Runner Volume (cc):
93cc
Exhaust Port Shape:
Round
Exhaust Port Location:
Standard
Exhaust Valve Angle:
11 degree
Intake Valves Included:
Yes
Intake Valve Diameter (in.):
2.165 in.
Exhaust Valves Included:
Yes
Exhaust Valve Diameter (in.):
1.600 in.
Valve Type:
Stainless
Maximum Valve Lift (in.):
0.700 in.
Valve Springs Included:
Yes
Valve Spring Type:
N/A
Outside Diameter of Outer Spring (in.):
N/A
Valve Guides Included:
Yes
Valve Guide Material:
Bronze
Valve Seats Machined:
Yes
Valve Seat Material:
Ductile iron
Valve Seat Machine Style:
Yes
Retainers Included:
Yes
Retainer Material:
Titanium
Valve Stem Seals Included:
Yes
Valve Stem Seal Style:
Viton
Locks Included:
Yes
Lock Style:
N/A
Camshaft Style:
N/A
Spark Plug Style:
N/A
Guideplates Included:
No
Guideplate Pushrod Size:
N/A
Rocker Arm Studs Included:
No
Rocker Arm Nut Thread Size:
8mm x 1.25
Accessory Bolt Holes Drilled:
Yes
Valve Cover Mounting Style:
Centerbolt
Heat Crossover:
No
Steam Holes Drilled:
N/A
Oiling Style:
Through pushrod
Machined for O-Ring:
Yes
Quantity:
Sold individually.
Make:
Chevrolet
Engine Family:
Chevy small block Gen III/IV (LS-based engines)
Engine Sizes:
6.0L/364-7.0L/427