Vialle regulator

[darren]

Anybody know what the settings for a vialle reg on a gm 350 vortec

[C3H8]

As per our discussion on the phone. You have an ECO system so the power mixtures are controlled by an electronic power valve. The balance screw should be turned all the way in and pre-set at 7 turns. If you experience any hesitation or acceleration issues open it an additional 1 to 2 turns. The idle screw would be pre-set at 1 to 2 turns out for closed loop (controlled idle). On open loop it would be set at 5 to 6 turns out initially and then slowly adjusted in until the idle speed dips and then turned out to the best RPM.