I'm building a fresh 493" EFI'd pump gas RB motor that had 10.2 to one compression. I had been running the mechanical DC carbs, but am switching to a Holley HP unit with coil-on-plug and a Wilson ported Victor single plane with their throttle body.

Does anyone know how much I can bump up the compression using pump gas while injecting straight methanol controlled by the Holley computer? I've heard I can run at least 11 to 1, but have never used methanol injection before.

1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)