Stock replacement, LS3 aluminum rectangular port cylinder head is assembled with 2.165" intake and 1.590" exhaust valves, 1.290" valve springs, retain-ers, locks, and seals. Heads include 68.4cc combustion chambers and D-shaped exhaust ports. Engineered for use on 4-bolt, LS-based engines with a 4.000"+ cylinder bore. Sold each.
- Cylinder Head Style:
- Assembled
- Cylinder Head Material:
- Cast aluminum
- Cylinder Head Finish:
- Natural
- CNC-Machined Combustion Chamber:
- No
- Combustion Chamber Volume (cc):
- 68.4cc
- Combustion Chamber Style:
- Heart
- CNC-Machined Intake Runner:
- No
- Intake Runner Volume (cc):
- 260cc
- Intake Port Shape:
- Rectangular
- Intake Port Location:
- Standard
- Intake Valve Angle:
- 15 degree
- CNC-Machined Exhaust Runner:
- No
- Exhaust Runner Volume (cc):
- N/A
- Exhaust Port Shape:
- D-port
- Exhaust Port Location:
- Standard
- Exhaust Valve Angle:
- 15 degree
- Intake Valves Included:
- Yes
- Intake Valve Diameter (in.):
- 2.165 in.
- Exhaust Valves Included:
- Yes
- Exhaust Valve Diameter (in.):
- 1.590 in.
- Valve Type:
- N/A
- Maximum Valve Lift (in.):
- 0.570 in.
- Valve Springs Included:
- Yes
- Valve Spring Type:
- Single
- Outside Diameter of Outer Spring (in.):
- 1.290 in.
- Valve Guides Included:
- Yes
- Valve Guide Material:
- Powdered metal
- Valve Seats Machined:
- Yes
- Valve Seat Material:
- Steel
- Valve Seat Machine Style:
- N/A
- Retainers Included:
- Yes
- Retainer Material:
- Steel
- Valve Stem Seals Included:
- Yes
- Valve Stem Seal Style:
- Positive stop
- Locks Included:
- Yes
- Lock Style:
- N/A
- Camshaft Style:
- Hydraulic roller
- Spark Plug Style:
- Angled
- Guideplates Included:
- No
- Guideplate Pushrod Size:
- N/A
- Rocker Arm Studs Included:
- No
- Rocker Arm Nut Thread Size:
- N/A
- Accessory Bolt Holes Drilled:
- Yes
- Valve Cover Mounting Style:
- Centerbolt
- Heat Crossover:
- No
- Steam Holes Drilled:
- No
- Oiling Style:
- Through pushrod
- Machined for O-Ring:
- 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.
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen III/IV (LS-based engines)
- Engine Sizes:
- 6.0L/364-7.0L/427
- Years:
- 1999-2019
