Trick Flow GenX ^® 185 cylinder heads for naturally aspirated GM LT1 can produce the big power numbers you crave . The reduced 21 ° valve angles increase piston-to-valve clearance , unshrouding the combustion chambers and boosting airfl ow . Power-building Fast As Cast ^® runners deliver CNC-style fl ow without the high cost of actual CNC-porting — saving you money that can be used to buy even more go-fast parts ! Then there ’ s the GenX ^® 185 ’ s other standard features : A356-T61 aluminum castings , 2.020 "/ 1.600 " stainless valves , PAC Racing Pacaloy™ valve springs , ductile iron valve seats , bronze alloy valve guides , and the ability to reuse all stock sensors and fittings .

Dyno Results GenX 185

Test Engine : 10.42:1 compression 350 c . i . d . with Trick Flow GenX ^® 185 cylinder heads ( TFS-30410008-M54 ), Trick Flow Track Max ^® hydraulic roller camshaft ( TFS-31402081 ), Trick Flow 1.6 ratio roller rocker arms ( TFS-31400513 ), stock GM intake manifold and 52mm throttle body , Hooker Super Competition headers with 1 ³ ⁄ 4 " primaries , 3 " dual exhaust with Flowmaster mufflers .

Airflow Results GenX 185

Lift Value Intake Flow CFM Exhaust Flow CFM

. 100 " 65 48 . 200 " 132 111 . 300 " 195 151 . 400 " 236 182 . 500 " 258 198

. 600 " 260 206

Tests conducted at 28 " of water ( pressure ). Bore size : 4.030 "; exhaust with 1 ³ ⁄ 4 " pipe .

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

GenX Top-End Engine Kit

Get up to 430 horsepower and 400 lbs . -ft . of torque from your GM LT1 with Trick Flow ’ s GenX Top-End Engine Kit . Carefully tuned by Trick Flow engineers , the kit includes GenX 185 heads , Track Max ^® hydraulic roller camshaft , pushrod length checker , roller rocker arms , head bolts , and a gasket set .

Track Max ^® Camshaft

If the complete top-end kit isn ’ t for you , consider the Track Max camshaft to go along with your new GenX 185 heads . With 220 °/ 227 ° duration at . 050 " and . 530 "/. 530 " of valve lift , it ’ s dyno proven to provide a broad torque curve and significant power increases in the 1,800-5,800 RPM range .

TFX™ Cold Air Intake Kits and Air Inlet Elbows

If you ’ re serious about wringing maximum power from your LT1 , you must eliminate intake restrictions . TFX Cold Air Intakes swap the stock airbox with a free-flow unit that dramatically increases airflow . The high-fl ow aluminum Air Inlet Elbow further increases airfl ow while adding some much-needed dress-up under the hood .

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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 .