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#1056906 - 04/15/18 12:01 AM MSD 8366 Distributor Modules are JUNK!  
Joined: Sep 2011
Posts: 93
Dan The Man 920 Offline
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Dan The Man 920  Offline
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Joined: Sep 2011
Posts: 93
East Rockaway, NY
I am sure that there is already threads on this subject, but I want to share my personal experience with everyone and hopefully help someone avoid the same problems I have faced. 2 winters ago(yes I drove my car in the snow) I purchased an MSD 8366 Pro-Billet Distributor to replace my Jegs small cap HEI unit which had a bad pickup coil and had the magnet severely rusted. Initial impressions were that the MSD unit was a very well built piece. Full billet housing, .500" diameter shaft, MSD's style of mag pick up trigger and an MSD brand module. I did not have a single issue up until last September where my car backfired and died driving down the parkway. The car had no spark or a cranking signal(tach was not moving when engine cranked). It turned out that my nearly new MSD distributor module was dead. After contacting MSD, they did right by me and replaced the module free of charge. I drove the car for about another 4 weeks and put it away for the winter(I got a winter beater for this year). Yesterday, I took it out for the first time this spring and it started right up and ran great. Today however, it was about 80 degrees and sunny so I took it out again. As I was cruising along, the car shut off and I was unable to re fire the car. Thankfully, I had an original, 30 year old ignition module with me that I swapped in on the side of the road. Sure enough, the car fired right up. IT KILLED ANOTHER MODULE! A brand new piece from MSD was dead with less than 24 hours of run time on it. Is there anyone out there who has had this same experience with MSD products? I thought they were better than this.


1987 Monte Carlo SS, Flowtech Headers, True Duals Jet stage 2 chip, KN filter Accel 300+ ignition, M/T ET Streets
Best E.T. 15.415@87.39mph
#1056908 - 04/15/18 12:32 AM Re: MSD 8366 Distributor Modules are JUNK! [Re: Dan The Man 920]  
Joined: Jan 2001
Posts: 4,331
supernova455 Offline
15+ Year
supernova455  Offline
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Joined: Jan 2001
Posts: 4,331
tampa, fl usa
Been there, done that, story is too long to type here. I learned long ago it is DAM hard to beat the GM ffactor HEI big or ssmall cap distributor!! Especially the moduels !

#1056912 - 04/15/18 02:08 AM Re: MSD 8366 Distributor Modules are JUNK! [Re: Dan The Man 920]  
Joined: Dec 1999
Posts: 11,243
86ttop Offline
15+ Year
86ttop  Offline
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Joined: Dec 1999
Posts: 11,243
Brooksville, Fl
You found out that MSD is junk. let me find a good thread and I'll post it.http://www.chevelles.com/forums/18-engine/1051057-exaust-popping-after-i-added-external-ignition-coil-video-post-2.html Dave Ray is the one to read, he's been in the ignition business for many years, good luck!!


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#1056918 - 04/15/18 04:42 PM Re: MSD 8366 Distributor Modules are JUNK! [Re: Dan The Man 920]  
Joined: Jul 2001
Posts: 1,092
Intmdatr3 Offline
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Intmdatr3  Offline
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Joined: Jul 2001
Posts: 1,092
North Central Wisconsin
I had the same problem last year with the Monte. The Monte died on us driving home from car show. Thought I fixed it when I replaced module but died on me again. Finally replaced the whole distributor will not have another MSD one again pure junk........


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#1056920 - 04/15/18 06:24 PM Re: MSD 8366 Distributor Modules are JUNK! [Re: Dan The Man 920]  
Joined: Sep 2007
Posts: 3,071
1 Slow SS Online content
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1 Slow SS  Online Content
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Joined: Sep 2007
Posts: 3,071
Small town USA
I also used MSD for many years with great success. Since I have moved to DUI for my newer builds.


Be a car builder, not a googler!
#1056940 - 04/17/18 01:23 PM Re: MSD 8366 Distributor Modules are JUNK! [Re: Dan The Man 920]  
Joined: Jun 2006
Posts: 1,508
thepezking639 Offline
10+ Year
thepezking639  Offline
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Joined: Jun 2006
Posts: 1,508
Livonia, MI
Yeah, I'd never willingly spend money on anything that MSD makes. Unless you spend time over 7K rpm, spray or shove boost down an motor. A GM HEI is all you need. And If you do use the bottle or boost, I recommend using LS coil near plug with a microsquirt and a reluctor wheel.

Last edited by thepezking639; 04/17/18 01:55 PM.

86 SS 6.0L LQ4, TBSS GEN IV intake, 92mm TB, 30lb injectors, LS3 cam and valvesprings, stainless long tube headers, Microsquirt ECU, Built 200-4R, B&M Megashifter, Torsen LSD, QA1 Lvl 3 Suspension Kit, UMI Front & Rear Braces. Check out my build thread: http://www.pro-touring.com/threads/126188-SSLOW6-0-Build
#1056948 - 04/18/18 02:20 PM Re: MSD 8366 Distributor Modules are JUNK! [Re: Dan The Man 920]  
Joined: Jun 2004
Posts: 243
Bitflipper Offline
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Bitflipper  Offline
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Joined: Jun 2004
Posts: 243
Las Vegas, NV
You're lucky you were only blowing modules. When my MSD distributor went it started creating a massive backfire due to misfiring. This ended up creating serious damage across my car including blowing out the catalytic converter, intake manifold gasket, and who knows what else I haven't found to this day. The thing that really kills me about the experience is that I went to the junk yard, found a Cadillac with an OEM distributor that looked to be in really good shape, swapped it in and the backfiring disappeared. I'm still running that distributor from the Cadillac donor.

So I definitely agree, those MSD distributors are junk and will cause thousands of dollars of damage beyond the distributor failure itself. Their ignition modules are also crap, they overheat and will leave you on the side of the road on a hot summer day after around 20-30 minutes of driving until they cool down, then fail again every few minutes until you finally get home.


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