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if your msd dist. cap does not have a vent hole in it drill one.

I drill a 1/4" dia. hole in mine where the original dwell adjustment window is.
my msd uses the stock style cap.

all msd distributors need to vent or they build up massive corrosion on the magnetic pick up fins then it starts to degrade spark signal.

last one I checked had 500 miles on it and looked like it had fungas growing in it. drilled hole in cap, sprayed wd-40 inside cap and its been fine ever since.
same here,

i have in all my cars msd rtr. And all are corroded inside like crazy but they working perfect.

Markus
 

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My car with an MSD R2R used to loose something like 75 to 100 HP when it got really really hot. Drove me nuts for a long time trying to figure it out. Turned out it was the module inside the R2R.

I don't know what it was doing to the spark, (retarding it?, making it weak?, ... ) but it sure as heck was the problem. Did it from new, it just took me too long to realize it.
 

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Just like a bad HEI module does. They are the same technology.
Rick, was that to me? If so, I didn't know HEI's went bad like that, I thought they just quit completely, then worked again when cooled off? Or just quit and never worked again. I think my MSD R2R retarded the spark because it never started to miss or anything??? But I'll be damned if I know what could go bad to make it do that?
 

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I thought they just quit completely, then worked again when cooled off? Or just quit and never worked again.
All I can say is that I think all 3 failure symptoms are all from similar causes.
 

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I've been running an MSD ready to run distributor with no box for 12 years now no problem. I've taken my 55 with 265 V8 on road trips, daily driven sometimes and track many times. I only changed the cap once the other year and it didn't really need it. Last year I locked it for racing but I have to put the springs and weights back in because winter starting is slow.
 

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I've also been running a MSD RTR in my Camaro for 8 years on a 1970 LT-1 with no problems. It works perfect, easy to setup with just a simple coil, no MSD box, plus an easy to set built in rev limiter, which I've hit. Running it right out of the box.
 

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I've been running an MSD ready to run distributor with no box for 12 years now no problem. I've taken my 55 with 265 V8 on road trips, daily driven sometimes and track many times. I only changed the cap once the other year and it didn't really need it. Last year I locked it for racing but I have to put the springs and weights back in because winter starting is slow.
You must be one of the the lucky 50%! Seriously, I'm sure it's not that bad but they do have a high failure rate. And from what I hear, the newer it is, the more likely it is to fail. Yours sounds like an oldie but a goodie. I have a distributor from MSD back before that was their name and it still works. Inside it has a Ford magnetic pickup coil and on the outside is a blue box with the electronics. Google Autotronic Controls. That is still their "real" name but they now do business as MSD.
 

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I've also been running a MSD RTR in my Camaro for 8 years on a 1970 LT-1 with no problems. It works perfect, easy to setup with just a simple coil, no MSD box, plus a built in rev limiter. Running it right out of the box.
Are you using the two stiff springs they have installed out of the box? :confused0006:
 

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You must be one of the the lucky 50%! Seriously, I'm sure it's not that bad but they do have a high failure rate. And from what I hear, the newer it is, the more likely it is to fail. Yours sounds like an oldie but a goodie. I have a distributor from MSD back before that was their name and it still works. Inside it has a Ford magnetic pickup coil and on the outside is a blue box with the electronics. Google Autotronic Controls. That is still their "real" name but they now do business as MSD.
Good to know, I’ll keep this one for my next 383 stroker build then. What is a good R2R distributor to use now?
 
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