WHAT'S IT WORTH? SHOULD I UPGRADE THE HEADS ON MY TURBO LS? HOW MUCH ARE PORTED HEADS WORTH ON A TURBO 4.8L LS? HOW MUCH ARE PORTED HEADS WORTH ON A STOCK OR CAMMED LS3? HOW MUCH ARE PORTED AFR HEADS WORTH ON A 408 STROKER? HOW MUCH ARE CNC PORTED GMPP LS3 HEADS WORTH ON A 468 STROKER LS3? CHECK OUT THIS VIDEO WHERE I DEMONSTRATED WHAT A CYLINDER HEAD UPGRADE IS WORTH ON SEVERAL DIFFERENT LS ENGINE COMBINATIONS, INCLUDING A 600+ HP CATHEDRALPORT, 408 STROKER. I ALSO TESTED THE GAINS OFFERED BY REPLACING THE STOCK 706 HEADS ON A TURBO 4.8L WITH TFS 205 HEADS. THE FINAL TEST WAS TO SHOW THE EFFECT OF CNC PORTED GMPP LS3 HEADS ON A STOCK LS3, THEN WHAT POWER THE CAM ADDS. I DUPLICATED THE STOCK HEADS VS CNC GMPP HEADS ON A LARGER, MORE POWERFUL 468 STROKER. MAKE SURE TO CHECK OUT richardholdenerperformance.com FOR DEALS ON CAM AND SPRING PACKAGES, INJECTOR UPGRADES AND LS7 LIFTERS.