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These Trick Flow GenX® 235 cathedral port cylinder heads for GM LSX engines are fully CNC-machined to significantly increase the performance of extreme performance LS-powered vehicles. Trick Flow engineers altered the valve angles from 15° to 13.5° to decrease valve shrouding, increase mid-lift airflow, and improve rocker arm-to-valve cover clearance. Material was added at the rocker arm mounting points to increase high-rpm valvetrain stability. The spark plugs were relocated in the CNC-profiled combustion chambers to enhance mid-lift airflow and increase the rigidity of the casting for extreme horsepower applications. Top-of-the-line CNC Competition Ported runners have a premium high resolution surface finish for maximum flow and performance.
| UPC: | 842645107290 |
| Combustion Chamber Volume (cc): | 70 |
| Intake Runner Volume (cc): | 235cc |
| Exhaust Runner Volume (cc): | 80cc |
| Cylinder Head Style: | Assembled |
| Cylinder Head Material: | Aluminum |
| Intake Port Shape: | Cathedral |
| Intake Valve Diameter (in): | 2.080 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): | 0.600 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 |
| Valve Cover Mounting Style: | Centerbolt |
| Accessory Bolt Holes Drilled: | Yes |
| Intake Valve Angle: | 13.5 |
| Exhaust Valve Angle: | 13.5 |
| Valve Guides Included: | Yes |
| Valve Guide Material: | Bronze |
| 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 can only be used on LS-based engines with a minimum bore diameter of 4.125 in. Must be used with roller rocker arms. Harland Sharp SLS17 roller rocker arms are recommended. |
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