Some parts are not legal for sale or use in California or other states with similar laws/regulations—see pg. 2 for details. WARNING: For Proposition 65 information, see pg. 2 GenX® 220 Cathedral Port Cylinder Heads for GM LS1 and LS2 Dyno Results GenX 220 for LS2 Test Engine: 10.1:1 compression GM 6.0L with Trick Flow GenX® 220 cathedral port cylinder heads (TFS-3061T002), Trick Flow Track Max® hydraulic roller camshaft (TFS-30602003), Harland Sharp 1.7 ratio roller rocker arms, FAST 90mm intake manifold, Kooks headers with 17⁄8" primaries, 3" dual exhaust with Flowmaster muffl ers. Specifi cations Material: A356-T61 aluminum Combustion Chamber Volume: 01: 64cc CNC-profi led 02: 65cc CNC-profi led Intake Port Volume: 220cc Fast As Cast Intake Port Location: Stock Intake Port Dimensions: 3.250" x 1.070" cathedral Intake Gaskets: Cathedral OEM GM O-ring style Intake Valve Diameter: 01: 2.040" (TFS-30600211) 02: 2.055" (TFS-30600210) Intake Valve Seat: Ductile iron interlock (TFS-51600271) Exhaust Port Volume: 80cc Fast As Cast Exhaust Port Location: Stock Exhaust Port Dimensions: 1.460" x 1.670" oval Exhaust Gaskets: GM 12617944 Exhaust Valve Diameter: 1.575" (TFS-30600212) Exhaust Valve Seat: Ductile iron interlock (TFS-30600274) Valve Angles: 13.5° Valve Guide Material: Trick Alloy powdered metal (TFS-30600252-1) Valve Seals: Viton® fl uoroelastomer canister (TFS-30600455) Valve Seat Angles: 45° x multi-angle Valve Spring Pocket Diameter: 1.480" Valve Spring I.D. Locators: 1.300" (TFS-21400442) Valve Spring Retainers: 7° x 1.300" o.d. steel (TFS-21400410) 7° x 1.300" o.d. titanium (TFS-214T0415) Valve Stem Locks: 7° steel bead lock (TFS-30600444) Valve Springs: 1.300" o.d. dual spring (TFS-16306-16) 150 lbs. @ 1.800" installed height 438 lbs. @ 1.200" open 448 lbs. per inch rate .600" maximum valve lift Cylinder Head Bolts/Studs: TFS-92010 (bolts) or ARP 234-4316 (studs) for pre-2004; TFS-92011 (bolts) or ARP 234-4317 (studs) for 2004 and later Rocker Arms: Roller rocker arms required Minimum Bore Diameter: 01: 3.900" 02: 4.000" Head Gaskets: 01: TFS-30694030-045 or TFS-30694030-051 02: TFS-30694060-045 or TFS-30694060-051 Pushrod Length: Longer than stock required Spark Plugs: NGK 4177 Viton® is a registered trademark of DuPont Performance Elastomers. Trick Flow GenX 220 cylinder heads are the best value in GM LS performance. The cathedral port GenX 220 heads incorporate the features of Trick Flow’s fully CNC-ported LS heads (13.5° valve angles, decreased valve shrouding, increased mid-lift airfl ow, relocated spark plugs, CNC-profi led combustion chambers with port-to-valve seat blending (bowl blending), improved rocker arm/valve cover clearance, and rigid casting design) in a more affordable “Fast As Cast®” version that fl ows nearly as much air as our CNC Competition Ported heads. The special Fast As Cast runner design duplicates the port shape and profi le of fully CNC-ported runners, resulting in near-CNC-ported performance for the same price as regular cast cylinder heads. These heads are emissions-legal under CARB E.O. #D-747 for 1997-2015 GM vehicles with 5.7L and 6.0L engines. Cylinder heads are available fully assembled or as bare castings. Sold individually. GenX 220 Heads, Fast As Cast Runners, Assembled TFS-30610001 LS1, 220cc intake runners TFS-3061T001 LS1, titanium retainers, 220cc intake runners TFS-30610002 LS2, 220cc intake runners TFS-3061T002 LS2, titanium retainers, 220cc intake runners cylinder heads. These heads are emissions-legal under CARB E.O. #D-747 for 1997-2015 GM vehicles with 5.7L and 6.0L engines. Airfl ow Results GenX 220 for LS2 Lift Value Intake Flow CFM Exhaust Flow CFM .100" 67 47 .200" 133 104 .300" 211 167 .400" 263 202 .500" 297 222 .550" 306 229 .600" 314 233 Tests conducted at 28" of water (pressure). Bore size: 4.000" CNC-profi led combustion chambers; exhaust with 17⁄8" pipe. Trick Flow GenX 220 Heads Top Summit Racing’s Project 1000, a Twin Turbo 6.0L LS Powerhouse! Summit Racing had a simple goal in mind: take a 6.0L LS block, stroke it to 408 cubic inches, fi ll it full of off-the-shelf performance parts, and top it with a pair of turbos to see if they could crack the magical 1,000 rear wheel horsepower benchmark. Handling the breathing on the impressive mill was a pair of straight-from-the-box Trick Flow GenX 220 heads with features like bowl-blended, CNC-profi led chambers, Fast As Cast ports, and top shelf valvetrain hardware. Once everything was buttoned up, it was strapped to the dyno at Trick Flow HQ to see if all the hard work paid off. We don’t want to give away the ending, but the results were eye-opening, to say the least! TFS-3061T001
