Increase the performance of GM LS-series engines. GenX aluminum cylinder heads have a 15ø to 13.5ø reduction in valve angle to reduce valve shrouding and increase mid-lift air flow. Heads are CNC-ported and include 1.300" dual valve springs and titanium retainers. Available for LS1 and LS2, in pairs, completely assembled.
- Cylinder Head Style:
- Assembled
- Cylinder Head Material:
- Cast aluminum
- Cylinder Head Finish:
- Natural
- CNC-Machined Combustion Chamber:
- Yes
- Combustion Chamber Volume (cc):
- 65cc
- Combustion Chamber Style:
- Heart
- CNC-Machined Intake Runner:
- Yes
- Intake Runner Volume (cc):
- 225cc
- Intake Port Shape:
- Cathedral
- Intake Port Location:
- Standard
- Intake Valve Angle:
- 13.50 degree
- CNC-Machined Exhaust Runner:
- Yes
- Exhaust Runner Volume (cc):
- 80cc
- Exhaust Port Shape:
- Oval
- Exhaust Port Location:
- Standard
- Exhaust Valve Angle:
- 13.50 degree
- Intake Valves Included:
- Yes
- Intake Valve Diameter (in.):
- 2.055 in.
- Exhaust Valves Included:
- Yes
- Exhaust Valve Diameter (in.):
- 1.575 in.
- Valve Type:
- Stainless
- Maximum Valve Lift (in.):
- 0.600 in.
- Valve Springs Included:
- Yes
- Valve Spring Type:
- Dual
- Outside Diameter of Outer Spring (in.):
- 1.300 in.
- Valve Guides Included:
- Yes
- Valve Guide Material:
- Bronze
- Valve Seats Machined:
- Yes
- Valve Seat Material:
- Ductile iron
- Valve Seat Machine Style:
- 3-angle
- Retainers Included:
- Yes
- Retainer Material:
- Titanium
- Valve Stem Seals Included:
- Yes
- Valve Stem Seal Style:
- Viton Positive stop
- Locks Included:
- Yes
- Lock Style:
- 7 degree titanium
- 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:
- Must be used with roller rocker arms. Harland Sharp SLS17 roller rocker arms are recommended. For use on engines with a minimum bore diameter of 4.000 in.
- CARB EO Number(s):
- D-747
- Emissions:
- California EO Approved
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen III/IV (LS-based engines)
- Engine Sizes:
- 6.0L/364
- Years:
- 1999-2019
