Ok, I don't usually post in this forum, bu I need some info....I have a '66 mustang I am swapping in a 4 valve engine(to be more specific a '94 lincoln mark viii engine...same as an early 4 valve cobra engine except for the intake manifold and a couple of other little things) anyway, I am using MegaSquirt to control this engine, I hope to get roughly stock Cobra power out of it without swapping the manifold with a bit of extra timing and fuel....anyway, one thing I will absolutely need on this is of course a working IMRC system, easy enough with MegaSquirt...I just need to know what voltage the IMRC solenoid uses to open the butterflies so I can build an appropriate output into Megasquirt to switch it on and off at the appropriate RPM(or whatever other RPM I chose to play with)