SY2455
70's Veteran
Outside of the VORTEC HEAD CASTING NUMBERS and the holy grail of 4.3 info!! . Does anyone know if the 2001 and later heads flow more? Did they continue to make inprovements to the heads and valvetrain? Is there a complete updated version of the holy grail of 4.3 info that has this information? You know the normal questions as you think about the head swap.