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Trick Flow® GenX® 255 Cylinder Heads for GM LS3 - TFS-3261T002-C01

Trick Flow® GenX® 255 Cylinder Heads for GM LS3


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Product Line:Trick Flow® GenX® 255 Cylinder Heads for GM LS3
Part Type:Cylinder Heads
Cylinder Head Style: Assembled
CNC-Machined Ports: Yes
Port Finish Type: CNC Competition Ported
Emissions Status: Non-emissions
Intake Port Volume: 255cc
Combustion Chamber Volume: 69cc CNC-profiled
Minimum Bore Diameter: 4.000 in.
Material: A356-T61 aluminum
Combustion Chamber Shape: Heart
Intake Valve Angle: 12 degree
Intake Port Location: Stock
Intake Port Shape: Square
Intake Port Dimensions: 2.250 in. x 1.250 in.
Intake Valve Diameter: 2.165 in.
Intake Valve Seat: Ductile iron
Exhaust Valve Angle: 12 degree
Exhaust Port Volume: 87cc
Exhaust Port Location: Stock
Exhaust Port Shape: Oval
Exhaust Port Dimensions: 1.460 in. x 1.700 in.
Exhaust Valve Diameter: 1.600 in.
Exhaust Valve Seat: Ductile iron
Valve Guide Material: Trick-Alloy powdered metal
Valve Seals: Viton® fluoroelastomer canister
Valve Seat Angles: 45 degree x multi-angle
Valve Spring Pocket Diameter: 1.480 in.
Valve Spring I.D. Locators: 1.300 in.
Valve Spring Retainers: Titanium
Valve Stem Locks: 7 degree
Valve Springs Included: Yes
Valve Springs: 1.300 in. o.d. dual spring
Valve Spring Seat Load: 155 lbs. @ 1.820 in. installed height
Valve Spring Open Load: 465 lbs. @ 1.200 in. open
Valve Spring Rate: 448 lbs. per inch rate
Valve Spring Maximum Valve Lift: .650 in.
Valve Cover Style: Center bolt
Spark Plug Style: Angle
Accessory Bolt Holes Drilled/Tapped: Yes
O-Ring Grooves: No
Heat Crossovers: No
Steam Holes: No
Quantity: Sold individually.
Notes: 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.

Cylinder Head, GenX® 255, CNC Comp Port, Assembled, 69cc CNC Chamber, 448 Lb. Springs, Ti Retain, GM LS3, Each

Trick Flow engineers combined the best features of factory GM LS3 and LS7 cylinder heads with their own race-winning engineering and technology to create the ultimate square port LS cylinder head for 4.000" and larger bore engines—the GenX® 255. Trick Flow GenX 255 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 ports accommodate LS3-style intake manifolds and LS9/LSA blower assemblies. Trick Flow GenX 255 heads are available with standard or 6-bolt per cylinder mounting patterns. The heads are available fully assembled or as bare castings.