Trick Flow GenX 255 Cylinder Heads for GM LS3 1.300″ Dual Valve Springs (448lbs./in.) Titanium Retainers & 6-bolt pattern – TFS-3261T004-C01
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Performance Cylinder 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 square port LS cylinder head for 4.000" and larger bore engines—the GenX® 255. The 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. GenX 255 heads are available with standard and 6-bolt per cylinder mounting patterns. Check out our extensive range today!
| UPC: | 842645109034 |
| Combustion Chamber Volume (cc): | 69 |
| Intake Runner Volume (cc): | 255cc |
| Exhaust Runner Volume (cc): | 87cc |
| Cylinder Head Style: | Assembled |
| Cylinder Head Material: | Aluminum |
| Intake Port Shape: | Rectangular |
| Intake Valve Diameter (in): | 2.165 in. |
| Cylinder Head Finish: | Natural |
| CNC-Machined Combustion Chamber: | Yes |
| 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. |
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