You don ’ t cut corners or accept compromises .

Use the best parts , like Trick Flow GenX ^® 255 square port cylinder heads that can signifi cantly increase the performance of your GM LS-powered car .

Highlights include LS3-shaped CNC Competition Ported runners , CNC-profi led combustion chambers , 12 ° valve angles , coolant holes that work with all LS head gaskets and engine blocks , and your choice of standard or 6-bolt mounting patterns — all engineered , machined , assembled , durability tested , and dyno proven in the USA to help your car stay ahead of the pack .

Dyno Results GenX 255 Square Port

Airflow Results

GenX 255 Square Port

Lift Value Intake Flow CFM Exhaust Flow CFM

Test Engine : GM 6.2L LS3 short block with 10.43:1 compression , Trick Flow GenX ^® 255 square port cylinder heads ( TFS-3261T002-C01 ), Trick Flow Track Max ^® hydraulic roller cam ( TFS-32603001 ), stock L92 intake with 90mm throttle body , Kooks headers with 1 ⁷ ⁄ 8 " primaries , and dual exhaust with 3 " Flowmaster mufflers .

. 700 " 382 258

Tests conducted at 28 " of water ( pressure ). Bore size : 4.065 "; exhaust with 2 " pipe .

New heads are just one component of the horsepower recipe . To make it complete , you ’ re going to need some more ingredients .

Track Max ^® Camshafts

Give your GM LS an even bigger power boost with a Track Max camshaft . Available in several hydraulic roller designs up to 230 °/ 238 ° duration and . 625 "/. 625 " of lift , they are dyno proven to produce significant power increases over the entire RPM range .

Active Fuel Management and Variable Valve Timing Delete Kits

The problem : most performance camshafts don ’ t work on engines equipped with AFM or VVT . The solution ? Ditch them with these delete kits ! They include everything to completely remove AFM and VVT the right way so your engine will make the power you expect with no hiccups .

Cylinder Head Bolt Kits

Keep combustion where it belongs ! These high-quality cylinder head bolt kits provide consistent clamping force . The bolts are made from premium quality alloy steel with cold-formed heads and rolled threads . The kit contains all the bolts you need to install a pair of heads .

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Some parts are not legal for use in California or other states with similar laws / regulations . Please check your state and / or local laws / regulations .