Hi folks. I've got a fresh 390 together for my daughter's 1970 F100. I fired it off with a carb, but now I'll be changing it over to EFI with a Holley Sniper TBI unit.
I'm using a standard small cap with a Duraspark mag pickup and I'm thinking about using the Sniper to control timing. To do so, I'll need to lock out my mechanical advance and then align the rotor for optimum spark. I'm expecting 14-16 degrees at idle and maybe 36 degrees all in with my Edelbrock heads.
Cam is very mild (did I mention this is a truck?). Duration at .050" is 215/220 with a 113 lobe separation. Just offering this information to anyone who may want to suggest a curve profile for this combo in a daily driver truck. I don't yet know how the rate of timing is programmed, as the kit is arriving later today. However, they do have this helpful little video that gives you an overview.
https://m.youtube.com/watch?v=oBSiyeg4XCUI'm assuming the ECU has a generic map that can be changed.
Anyway, my major question here is this: Do I have any options for an adjustable rotor for my Ford distributor? I refuse to use an MSD distributor (not looking for an argument here, that's just how it's going to be).
I have a couple ideas on making my own, but if an elegant solution already exists, I'll use it.
Thanks.
Holley uses a 45 degree reference point for their ECU and then maps the timing based on your