FITS ANY LS SERIES ENGINE BLOCK WITH 4.000" BORE OR LARGER.  

12629063 LS3 Cylinder Head Assembly Features:

Aluminum performance head

• Fits any LS family engine with 4.00" bore or larger
• 2.165" hollow stem intake, and 1.59" solid stem exhaust valves
• .550" max valve lift
• As-cast L92 style 260cc intake ports
• D-shaped exhaust ports
• As-cast combustion chambers

Cylinder Head, LS3, Assembled, Aluminum, 70cc Chamber, 260cc Intake Runner, Chevy, Each

Cylinder Head Style:Assembled

Cylinder Head Material:Aluminum

Intake Valve Diameter (in):2.160 in.

Cylinder Head Finish:Natural

Combustion Chamber Volume (cc):70

CNC-Machined Combustion Chamber:No

Intake Runner Volume (cc):260cc

CNC-Machined Intake Runner:No

CNC-Machined Exhaust Runner:No

Intake Port Shape:Rectangular

Intake Port Location:Standard

Exhaust Port Shape:D-port

Exhaust Port Location:Standard

Spark Plug Style:Angle

Intake Valves Included:Yes

Exhaust Valves Included:Yes

Exhaust Valve Diameter (in):1.590 in.

Valve Springs Included:Yes

Maximum Valve Lift (in):0.550 in.

Damper Spring Included:No

Number of Springs Per Valve:Single

Retainers Included:Yes

Retainer Material:Steel

Locks Included:Yes

Valve Stem Seals Included:Yes

Valve Stem Seal Style:Positive stop

Rocker Arm Studs Included:No

Rocker Arms Included:No

Rocker Arm Nuts Included:No

Guideplates Included:No

Valve Cover Mounting Style:Centerbolt

Accessory Bolt Holes Drilled:Yes

Intake Valve Angle:15

Exhaust Valve Angle:15

Valve Guides Included:Yes

Valve Guide Material:Powdered metal

Valve Seats Machined:Yes

Valve Seat Material:Steel

Steam Holes Drilled:No

Oiling Style:Through pushrod

Machined for O-Ring:No

Heat Crossover:No

Quantity:Sold individually.

Notes:These cylinder heads can only be used on 4 bolt LS-based engines with a 4.000 in. bore or larger.