Ultimate Bolt-On Performance

It’s no secret—GM LS engines are the hottest thing to hit the scene since Chevy debuted the first small block back in 1955. Thanks to its compact dimensions, high power output, and lightweight construction, one version or another of this engine series has found its way under the hood of all GM’s hottest production cars since 1997.

4.8L and 5.3L iron block versions of the LS platform (the Vortec) have found their way into millions of GM pickups, vans, and SUVs. Until recently, no one gave these motors a great deal of consideration. But as more and more GM trucks make their way into the boneyards, the “little” LS engines are finding their way back to the street as the power plant of choice for kit cars, hot rods, musclecars, street machines, and sport trucks.

To build serious street power, all that’s needed is a good set of heads—Trick Flow’s new GenX Street Cylinder Heads.

Starting with the track-proven GenX Street/Strip LS head design, Trick Flow engineers refined the combustion chambers to retain the stock compression ratio and work with the smaller bore diameters of the 4.8L, 5.3L, and 5.7L engines. They also modified the chambers to unshroud the valves and increase airflow and swirl. The GenX Street heads are available in three versions:

• Option One features standard cast chambers and our Fast As Cast™ ports that precisely duplicate the port shape and profile of fully CNC-ported heads, and valve seat-to-port bowl blending for better transition from the chambers to the ports.
• Option Two combines the Fast As Cast runners with fully CNC-profiled combustion chambers and bowl blending for improved airflow.
• Option Three features fully CNC-machined and bowl-blended chambers and CNC-ported runners for maximum airflow.

In any configuration, GenX Street cylinder heads outflow and outperform factory LS6 heads.

GenX Street heads are fully assembled and ready to bolt on right out of the box. The components include lightweight stainless steel 2.000" intake/1.575" exhaust valves, high lift valve springs, chromemoly steel retainers, ductile iron valve seats, retain the use of all stock sensors and fittings and can accommodate aftermarket roller rocker arms. Bare cylinder head castings are also available.

Specifications
Material:	A356-T61 aluminum
Combustion Chamber Volume:	01: 59cc 01-CNC: 58cc 01-C00: 58cc
Intake Port Volume:	205cc
Intake Port Location:	Stock
Intake Valve Diameter:	2.000"
Indake Valve Seat:	Ductile iron
Exhaust Port Volume:	80cc
Exhaust Port Location:	Stock
Exhaust Valve Diameter:	1.575"
Exhaust Valve Seat:	Ductile iron
Valve Guide Material:	Trick-Alloy powdered metal
Valve Seat Angles:	37° x 45° x 64° intake; 37° x 45° x 60° exhaust
Valve Spring Pocket Diameter:	1.480"
Valve Spring Retainers:	7° x 1.300" chromemoly steel
Valve Stem Locks:	7° steel with bead lock
Rocker Arm Type:	Roller rocker arms recommended

GenX Street Heads, Assembled
TFS-30500001 Standard chambers, Fast As Cast runners, 205cc intake runners
TFS-30500001-CNC CNC-profiled chambers, Fast As Cast runners, 205cc intake runners
TFS-30500001-C00 Fully CNC-ported chambers and runners, 205cc intake runners

When the engineers at GM developed the LS series of engines, they provided enthusiasts with the most technologically advanced small block Chevy ever. Now, Trick Flow has raised the bar of Serious Horsepower and developed LS cylinder heads that significantly increase the performance of late model GM musclecars.

During the development stage of the fully CNC-ported Trick Flow GenX Street/Strip CNC cylinder heads, Trick Flow engineers determined the valve angles needed to change from 15° to 13.5° to decrease valve shrouding, increase mid-lift airflow, and improve rocker arm-to-valve cover clearance. Testing also proved that relocating the spark plugs in the combustion chambers further enhanced mid-lift airflow and increased the rigidity of the casting for extreme horsepower applications. Furthermore, additional material was added to the rocker arm mounting points for high-rpm valvetrain stability.

These fully CNC-ported performance cylinder heads feature 215cc (LS1), 225cc (LS2), or 235cc (LSX) intake runners, 80cc exhaust runners, 64cc (LS1), 65cc (LS2), or 70cc (LSX) combustion chambers, 2.040" (LS1), 2.055" (LS2), or 2.080" (LSX) intake valves, 1.575" (LS1/LS2) or 1.600" (LSX) exhaust valves, bronze valve guides, and ductile iron intake and exhaust valve seat inserts.

Assembled heads come equipped with 1.300" dual valve springs (for hydraulic roller camshafts up to .600" of valve lift), Viton® fluoroelastomer canister-style valve seals, 7° machined steel valve locks, and 7° titanium retainers. Bare cylinder head castings are also available.

GenX Street/Strip Heads, Assembled
TFS-3060T001-C01 LS1, 215cc intake runners
TFS-3060T001-C02 LS2, 225cc intake runners
TFS-3060T001-C03 LSX, standard bolt pattern, 235cc intake runners

New for 2009! GenX Street/Strip CNC cylinder heads for GM LSX are now available with a 6-bolt mounting pattern for high compression, high boost applications.
TFS-3060T003-C03 LSX, 6-bolt pattern, 235cc intake runners

Specifications
Material:	A356-T61 aluminum
Combustion Chamber Volume:	C01: 64cc C02: 65cc C03: 70cc
Intake Port Volume:	C01: 215cc C02: 225cc C03: 235cc
Intake Port Location:	Stock
Intake Valve Diameter:	C01: 2.040" C02: 2.055" C03: 2.080"
Indake Valve Seat:	Ductile iron
Exhaust Port Volume:	80cc
Exhaust Port Location:	Stock
Exhaust Valve Diameter:	C01/C02: 1.575" C03: 1.600"
Exhaust Valve Seat:	Ductile iron
Valve Guide Material:	Bronze alloy
Valve Seals:	Viton® fluoroelastomer canister
Valve Seat Angles:	37° x 45° x 64° intake; 37° x 45° x 60° exhaust
Valve Spring Pocket Diameter:	1.480"
Valve Spring Retainers:	7° x 1.300" o.d. titanium
Valve Stem Locks:	7° machined steel
Valve Springs, Standard:	1.300" o.d. double spring 150 lbx. @ 1.800" installed height 438 lbs. @ 1.200" open 448 lbs. per inch rate .600" maximum valve lift
NOTE:	Roller rocker arms required