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Trick Flow® GenX® 255 Cylinder Heads for GM LS3 TFS-3261T004-C01

Cylinder Head, GenX® 255, CNC Comp Port, Assy, 69cc CNC Chamber, 448 Springs, Ti Retain, 6-Bolt, GM LSX, Each

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Brand: Trick Flow Specialties

Manufacturer's Part Number: TFS-3261T004-C01

Part Type: Cylinder Heads

Product Line: Trick Flow® GenX® 255 Cylinder Heads for GM LS3

Summit Racing Part Number: TFS-3261T004-C01

UPC: 842645109034

Cylinder Head Style: Assembled

Cylinder Head Material: Aluminum

Intake Port Shape: Rectangular

Intake Valve Diameter (in): 2.165 in.

Cylinder Head Finish: Natural

Combustion Chamber Volume (cc): 69

CNC-Machined Combustion Chamber: Yes

Intake Runner Volume (cc): 255cc

Exhaust Runner Volume (cc): 87cc

CNC-Machined Intake Runner: Yes

CNC-Machined Exhaust Runner: Yes

Combustion Chamber Style: Heart

Intake Port Location: Standard

Exhaust Port Shape: Oval

Exhaust Port Location: Standard

Spark Plug Style: Angle

Intake Valves Included: Yes

Exhaust Valves Included: Yes

Exhaust Valve Diameter (in): 1.600 in.

Valve Springs Included: Yes

Maximum Valve Lift (in): 0.650 in.

Outside Diameter of Outer Spring (in): 1.300 in.

Damper Spring Included: No

Number of Springs Per Valve: Dual

Retainers Included: Yes

Retainer Material: Titanium

Locks Included: Yes

Lock Style: 7 degree

Valve Stem Seals Included: Yes

Rocker Arm Studs Included: No

Rocker Arms Included: No

Rocker Arm Nuts Included: No

Guideplates Included: No

Accessory Bolt Holes Drilled: Yes

Intake Valve Angle: 12

Exhaust Valve Angle: 12

Valve Guides Included: Yes

Valve Guide Material: Powdered metal

Valve Seats Machined: Yes

Valve Seat Machine Style: 3-angle

Valve Seat Material: Ductile iron

Steam Holes Drilled: No

Oiling Style: Through pushrod

Machined for O-Ring: No

Heat Crossover: No

Quantity: Sold individually.

Notes: These cylinder heads are not designed as a stock replacement, they can only be used on 6 bolt LSX-based engines with a minimum bore diameter of 4.000 in. 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. Does not fit 2010 and later Chevrolet Camaro OEM exhaust manifolds; aftermarket headers are required.

CARB EO Number: D-747-1 (pdf)
To see a list of qualifying vehicles, enter CARB EO Number D-747-1

Emissions: California EO Approved

In-Store Pickup: Choose In-store pick-up (OH, NV, GA, TX) on our web site.

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Trick Flow engineers used the best features of OEM GM LS3 and LS7 cylinder heads, combined with their own race-winning engineering and technology, to create the GenX® 255—the ultimate ultimate square port LS cylinder head for 4.000" and larger bore engines. The heads feature fully CNC Competition Ported runners with a premium high resolution surface finish for maximum airflow and performance potential. Stock LS3 ports accommodate LS3-style intake manifolds and LS9/LSA blower assemblies. 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. GenX 255 heads are available with standard or 6-bolt per cylinder mounting patterns.

Trick Flow GenX 255 cylinder heads are emissions-legal under CARB E.O. #D-747 for 2007-present GM vehicles with 6.2L engines. They are available fully assembled or as bare castings. Sold individually.


Questions & Answers Ask a Product Question

I am currently running a 402 ls2 with tea stage 2 799 heads and a comp cams 54-462-11 cam (.624 lift/243-251 duration @.50. would I need to do a cam change to optimize these heads? Thanx Steven

Asked by MARK on August 12, 2018


Thank you for your question. The Trick Flow Specialties TFS-3261T004-C01 cylinder heads are compatible with the COMP Cams 54-462-11 camshaft. This combination will make excellent midrange and top end power.

Summit RacingSummit Racing Answer - September 04, 2018

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Is the valve a stainsteel or titanium and is it s ferea brand valve?

Asked by HAMAD on January 17, 2018


Thank you for your question. The Trick Flow Specialties TFS-3261T004-C01 cylinder heads include stainless steel Trick Flow private brand valves. The intakes are part number 32600211 and the exhausts are part number 32600212.

Summit RacingSummit Racing Answer - February 07, 2018

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Will this 6 bolt heads bolt on to a stock 2010 Camaro SS shortblock without modification?

Asked by CHRISTOPHE on October 31, 2017


Thank you for your question. The 6-Bolt TFS-3261T004-C01 it will bolt to an otherwise stock 4-Bolt LS3. It will cover the factory lifter trays, but not interfere. When you go with a 6-bolt block later, you will need to run link-bar lifter or a block that uses the LSX style bolt-in retainers.

Summit RacingSummit Racing Answer - October 31, 2017

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Does this head use the LS7 bolts?

Asked by JACK on April 28, 2016


Thank you for your question. The Trick Flow Specialties TFS-3261T004-C01 - Trick Flow® GenX® 255 Cylinder Heads for GM LS3 use different bolts depending on the year of the engine block. The recommended bolts are in the instructions. Please copy and paste the link below into your web browser to see them.

Summit RacingSummit Racing Answer - July 06, 2016

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Some parts are not legal for use in California or other states with similar laws / regulations

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