These Trick Flow GenX® 205 cathedral port cylinder heads are fully CNC-machined to significantly increase the performance GM's 4.8L/5.3L/5.7L LS engines. 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. Top-of-the-line CNC Competition Ported runners have a premium high resolution surface finish for maximum flow and performance. 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. Material was added at the rocker arm mounting points to increase high-rpm valvetrain stability. Trick Flow GenX 205 cylinder heads are emissions-legal under CARB E.O. #D-747 for 1997-present GM vehicles with 4.8L, 5.3L, 5.7L, and 6.0L engines. They are available fully assembled or as bare castings. Sold individually.

More From This Category

AFR Valve Seat, BB Chevy 18° Beryllium Intake 2.500 OD X 2.000 ID X .500

AFR Valve Seat, BB Chevy 18° Beryllium Intake 2.500 OD X 2.000 ID X .500

$122.43

Trick Flow Cylinder Head, PowerPort 290, Fast As Cast , Assy, 74cc Chambers, 138 Lb. Spring, Ti Ret, For Ford 429/460, Each

Trick Flow Cylinder Head, PowerPort 290, Fast As Cast , Assy, 74cc Chambers, 138 Lb. Spring, Ti Ret, For Ford 429/460, Each

$3,172.60