I'm having my engine builder rebuild my stock 350 with the goal of low end torque for cruising and mpg. He recommends a custom roller cam that swaps the firing order of the #7 and #4 cylinders. He said it improves the idle quality, efficiency and sounds better. Does anyone have any experience with this style of cam and what to expect? Duration is ~ 218, 226 with .480 lift.
The rest of the rebuild is typical, new pistons, turn the crank, but going with longer, undercut valves, and springs to match the roller hyd cam. Also going one size larger on the intake valve but stock exhaust on the #47 heads, but longer duration on the cam to compensate.
The rest of the drivetrain is 200-4r overdrive with lockup, and 2.56 posi
