If you're looking for the best value in GM LSX performance, look no further than these Trick Flow® new GenX (TM) street/strip fast as cast aluminum cylinder heads. The GenX (TM) as-cast heads feature all of the same goodies that make the CNC-ported heads so incredible--13.5 degree valve angles, decreased valve shrouding, increased mid-lift airflow, relocated spark plugs, improved rocker arm-to-valve cover clearance, and a rigid casting design for extreme horsepower applications--but in a more affordable, as-cast version that flows nearly as much air as the ported heads.