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Trick Flow Specialties
Ultimate Bolt-on Performance!
Ultimate Bolt-on Performance!

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Trick Flow GenX® LS Cylinder Heads Now Emissions-Legal in All 50 States
Rejoice, late model LS fans! All Trick Flow GenX aluminum cylinder heads for GM LS engines are now emissions-legal for use in all 50 states on all 1997 to 2015 GM vehicles (except 2014-15 Corvette) originally equipped with an LS engine (CARB E.O. Number D-747).
Want to improve the performance of your 5.3L Silverado? Building a big-cubic inch or supercharged LS7 for your fifth-gen Camaro or a serious LS3 for a C5 Vette?  Trick Flow has you covered with its complete line of GenX cylinder heads:
GenX Cathedral Port Cylinder Heads
Trick Flow GenX cathedral port cylinder heads are designed to increase the performance of LS1-, LS2-, and LSX-powered cars and trucks. Top-of-the-line CNC Competition Ported runners have a premium high-resolution surface finish for maximum flow and performance. 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.

The GenX Cathedral Port Cylinder heads are available with 205cc intake runners ideal for 4.8L, 5.3L, and 5.7L LS engines, or with your choice of 215, 224, 235, and 245cc intake runners for larger cubic inch LS1 and LS2 engines.
Trick Flow also offers the GenX 220 Cathedral Port cylinder head for LS1 and LS2. This head features a “Fast As Cast”® runner design that duplicates the port entry and runner of Trick Flow’s CNC-ported heads in an affordable, as-cast cylinder head.
GenX 255 Square Port Cylinder Heads for LS3
Trick Flow engineers took the best features of factory GM LS3 and LS7 cylinder heads and added their own airflow expertise to create the ultimate square port LS cylinder head for large-bore (4.00 inch and up) LS3 engines. The 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. GenX 255 heads are available with standard and 6-bolt per cylinder mounting patterns.
GenX 260 Square Port Cylinder Heads for LS7
Trick Flow’s GenX 260 square port aluminum cylinder heads are designed for LS-based engines with a minimum bore diameter of 4.100 inch. Trick Flow improved the factory LS7 design by adding more material for increased rigidity and strength. The heads also feature removable modular one-piece, 2024-T4 billet aluminum rocker arm mounts for high-end shaft rocker setups.

Trick Flow’s high flow, high velocity CNC Competition Ported runners with the premium high-resolution surface finish provide all-out air flow and performance throughout the entire powerband. Other major improvements include a 6-bolt per cylinder head retention pattern for use on Chevrolet Performance LSX and other aftermarket blocks, clearance for 3/8 inch pushrods, and through-deck coolant holes to fit all GM LS gasket and block combinations.

Trick Flow GenX 260 Square Port Cylinder Heads work with all LS7-style intake manifolds. The heads maintain the factory intake and exhaust port locations, valve angles, and valve locations for use with existing LS7-based pistons.

Trick Flow GenX LS Cylinder Heads are available fully assembled or as bare castings. Fully assembled heads include stainless steel valves, valve springs, steel or titanium spring retainers, and valve locks. The GenX 255 and 260 square port heads are also available with optional valve spring packages.

For complete specifications, airflow charts, and dyno results for GenX LS cylinder heads, please visit
Trick Flow Specialties

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New from Trick Flow Specialties: PowerPort® 365 Cylinder Heads for Big Block Chevrolet

Trick Flow’s PowerPort 365 aluminum cylinder heads offer a great combination of big flow and cost effectiveness. Designed to extract as much power from the conventional big block Chevy design as possible, the cylinder heads are ideal for racers that want extra airflow, but don’t necessarily want to go through the hassle and expense of converting to a “Big Chief” style cylinder head.
The PowerPort 365s have Trick Flow’s CNC Competition Ported runners; this top-of-the-line CNC machining process gives the runners a smooth, high resolution finish to maximize airflow. Trick Flow also revised the CNC-profiled combustion chambers to 119cc to help support higher compression ratios without compromising airflow.
A lot of work was spent balancing and maximizing airflow among all eight intake runners. On a factory-style head, the runners for cylinders one, four, five, and eight are “curved wall,” or dogleg style. These runners flow less than the other “straight wall” runners, meaning their respective cylinders get less air. Trick Flow reworked the curved wall runners on the PowerPort 365s to increase their airflow capacity. The result is more equally balanced airflow to all cylinders, which produces more power.
As tested on Trick Flow’s Superflow bench, peak airflow is 424 cfm intake/337 cfm exhaust at .900 inches of valve lift. The PowerPort 365s flow well at mid-lift too; the intake side flows 385 cfm at .600 inch lift and 411 cfm at .700 inch.
The PowerPort 365s love cubic inches, high compression, or a power adder like nitrous and supercharging. Trick Flow recommends using the heads on engines that are 500 cubic inches or larger.
Trick Flow PowerPort 365 Specifications
• Combustion Chambers: 119cc, CNC-profiled
• Intake Runners: 365cc CNC Competition Ported, stock location
• Exhaust Runners: 135cc CNC Competition Ported, ports raised .300 inch from stock
• Valves: 2.350 inch intake and 1.880 inch exhaust, one-piece stainless steel
• Valve Springs: Trick Flow by Pac Racing Pacaloy™1.645 inch diameter triple, rated to .900 inches of valve lift
• 10 degree titanium valve spring retainers and 10° steel valve locks
• 7/16 inch rocker arm studs and guideplates for 3/8 inch pushrods
• Can accommodate 7/16 inch pushrods to handle stiff race-style valve springs
• Accepts stud-mount or shaft-mount rocker arms


Trick Flow Specialties

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Attention mod motor racers! Trick Flow's Valve Cover-Mount Ignition System allows you to take complete and accurate control of your race-prepped motor's ignition timing in applications with custom fuel management systems or carburetor conversions. Designed specifically for use with Trick Flow's Twisted Wedge® and Twisted Wedge Track Heat® cylinder heads for the 4.6L 2V, these systems feature a valve cover-mounted MSD distributor driven off the driver's side camshaft plus a pair of modified Trick Flow cast aluminum valve covers, a distributor mount and hold-down, a hex drive cam bolt and washer, spark plug wires, and all necessary brackets and mounting hardware.
Additional information:
* Can only be used with Trick Flow Twisted Wedge® and Twisted Wedge Track Heat® cylinder heads for Ford 4.6L 2V
* Requires relocation of the OE power steering reservoir or conversion to manual rack and pinion steering
* An ignition box compatible with an MSD Pro-Billet distributor is required
* For racing use only

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Trick Flow® Twisted Wedge® 11R 205 Cylinder Heads for Small Block Ford

Something great just got better! Trick Flow has taken its track-proven Twisted Wedge design and, using advanced 3D solid modeling and CAD tools, plus a couple decade’s worth of racing experience, has made it even more potent for serious performance enthusiasts and racers.
Trick Flow’s new Twisted Wedge® 11R 205 cylinder heads feature 11° intake and 13° exhaust valve angles and a restructured combustion chamber arrangement for more airflow and performance potential. The new high velocity, race-inspired runners have been optimized for today’s popular bore and stroke combinations. Premium certified materials and components, along with the finest CNC tooling, are used to ensure uncompromising quality and durability, dimensional accuracy, and balanced flow from port-to-port. Fully machined castings increase strength and project a great-looking billet-like appearance.
Twisted Wedge 11R 205 heads come with top-of-the-line CNC Competition Ported runners with fully CNC-machined runners and chambers with a premium high resolution finish for ultimate performance. The heads are a direct replacement for previous Twisted Wedge heads and work with all Twisted Wedge specific pistons.
Cylinder heads are available fully assembled or as bare castings.

Click here for part numbers and options for the 205 version:

Click here for part numbers and options for the 190 version:

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