MSD or not
Look up P4120889 and you get a Mopar Performance coil that is not recommended for rpm above 6500,
That's what it says all rightee............, not recommended,lol. It's also not recommended that you eat pork.
I read that 6500-thing too when I was coil-shopping, but was willing to take a chance, as I thought my 292 cammed (at that time) 367 probably would never go that high anyway. Well after the first missed shift (4-speed car) that thought was history. I guess that coil was already in there in 2000, cuz that 292 cam came out in late summer that year.
Mine has been working excellently up to my 7000 shift point, Besides I only go there once on the way to 60 mph. But you know, when I do, it's often at 7000 from zero mph all the way to 60 mph........ or more;I can't help myself; the screaming small block is so addictive!, so in the coil's defense, it's at 7000plus for 5 or 6 sometimes 8 seconds at a crack, many many times a week. Which is,without a doubt, way more than it would spend there at the track. In fact, I wonder if one week with me, is like a year or more at the dragstrip. The rev limiter is set to 7200, but I try not to bounce off it too often.
All my 3 cams have spent a good lot of time at 7000,lol.
You remember that missed shift back there in paragraph 1? By the Time I got it into gear and looked over at the tach I saw the needle coming DOWN........ from 8000, so I have no idea how high it actually went. The engine never skipped a beat and the coil kept right up. That was when I ordered the rev-limiter,lol. Also, that was on the Orange box. The tach was a new AutoGAGE 270*sweep, that only has numbers to 8000,lol.
And that was also about the time when I took the shifter apart to figure out why it was hanging up, and fixed it.
My thought was this, and it's just a thought.
That coil really puts out, and to put out like that, it has to suck the juice. If that juice all comes thru the ignition switch, my thought was how long is that 40 year old circuit gonna put up with that. So I put it on a relay straight to the battery,with a 12ga wire;triggered by the ignition circuit. BadaBoom I thought........... seems to be working. I put that coil on it's side, connections down, on the apron up front where the disconnected horns are (they got me into too much trouble), with about a 3ft coilwire. That is hurdle #1 for a would-be thief, if the wire ain't there.
I also relayed my Halogen headlights, for the same reasom; lottsa electron-flo.
