Product Description
Trick Flow 255cc LS3 Cylinder Heads - 69CC Chamber
Fits 4.000"+ Bore Rectangle Port LS Engines LS3 L99 L76 L77 LSA L92 L96 L94 L9H
Sold as a Pair of 2 Assembled 4-Bolt Heads
Trick Flow engineers combined the best features of factory GM LS3 and LS7 cylinder heads with Trick Flow’s own unique brand of race-winning engineering and technology to create the ultimate rectangle port LS cylinder head for 4.000" and larger bore engines—the GenX® 255. These heads feature fully CNC Competition Ported runners with a premium high resolution surface finish for maximum airflow and performance potential. The valve angles have been changed from 15° to 12° to increase piston-to-valve clearance and allow the use of larger camshafts. The coolant holes through the head deck were redesigned to work with all LS head gasket and engine block combinations. Stock LS3 port location accommodates LS3-style intake manifolds and LS9/LSA blower assemblies.
These fully assembled cylinder heads include valve springs, titanium retainers, forged steel valve locks, and valves. They are emissions-legal under CARB E.O. #D-747 for 2007-present GM vehicles with 6.2L engines.
Overview:
- Combustion Chamber Volume: 69cc
- Intake Runner Volume: 255cc
- Exhaust Runner Volume: 87cc
- Cylinder Head Style: Assembled
- Cylinder Head Material: Aluminum
- Camshaft Style: Hydraulic Roller
- Intake Port Shape: Rectangular
- Intake Valve Diameter: 2.165"
- CNC-Machined Combustion Chamber: Yes
- CNC-Machined Intake Runner: Yes
- CNC-Machined Exhaust Runner: Yes
- Exhaust Valve Diameter: 1.600"
- Valve Springs Included: Dual Hydraulic Roller Springs
- Maximum Valve Lift: 0.650"
- Outside Diameter of Outer Spring: 1.300"
- Retainer Material: Titanium
- Lock Style: 7 Degree Forged
- Valve Stem Seals Included: Yes
- Valve Guide Material: Powdered Metal
- Intake Valve Angle: 12 Degree
- Exhaust Valve Angle: 12 Degree
- Quantity: Sold as a Set of 2 Assembled Heads
Notes: These cylinder heads can only be used on engines with a minimum bore diameter of 4.000". Includes new rocker arm rail mounts for use with LS3 1.7 ratio rocker arms. OEM rocker arm rail mounts will not work with these heads.
