[Sun Tuned]

Yes, Bart is right….”good oil”.

Used to be fairly common occurrence around here years back to see HEI distributors triggering MSD boxes. Don’t hardly see it anymore at all these days.

I think a lot of folks were mistakenly under the illusion that MSD was firing multiple sparks throughout the ENTIRE rom range and that is simply not correct. They only do the multiple spark thing up to 3000 rpm then it reverts back to a single long duration spark.

Works just like a regular msd distributor… except instead of the black with purple tracer and black with orange tracer for the msd mag pickup….. you just use an HEI and the green and white mag pickup leads.

I think another reason you don’t see as many HEI’s is some people can’t spare the room for it…. Multiple carbs etc.

Fixed properly with good solid parts the damn things are near indestructible. Now I know lots of folks have had issues, but I believe there were other underlying things going on to cause them.

Just like a points distributor … fixed properly with the right parts…. Their also near indestructible , at least for about 15,000 miles or so before one needs to check the dwell.

Endplay on all these distributors is a real “sky is falling subject”. Personally I think folks place way too much emphasis on this. For sure more than is needed.
I’ll say this. On a cast iron unit you can within reason so pretty much whatever you want. You can shim them tighter than the aluminum units simply because the aluminum expands at a greater rate than the iron.

With that said, there is no need to do this. That shimming thing was originally designed as a sort of workaround to counter a looser than ideal reluctor assy . And that idea was an opinion at best to begin with.

I see too many shimmed too tightly on a regular basis.
That will cause far more harm than good.