Thinking of going from MSD to HEi - Chevelle Tech
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post #1 of 45 (permalink) Old Jul 5th, 19, 4:48 PM Thread Starter
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Thinking of going from MSD to HEi

Anyone done it? Only reason I used this was concern over fouling plugs due to a lot of overlap.

383 [email protected] SR cam, gears stick etc.

Experiences?? Dont need a rev limiter my ear works fine. In fact removing the tach also.

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post #2 of 45 (permalink) Old Jul 5th, 19, 7:28 PM
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Re: Thinking of going from MSD to HEi

After my last MSD box failed, I put the HEI back the way it was. I have not had any issues since. My cam has 65į of overlap (282į intake duration, 288į exhaust duration) and I have not had any issues with fouling since I made the change. I think you will be fine.

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post #3 of 45 (permalink) Old Jul 5th, 19, 7:59 PM
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Re: Thinking of going from MSD to HEi

The HEI puts out a strong spark and I have run them to 7000 rpm with no issues. It's one of the best ignition systems out there. Some people say they won't pull the rpms I'm running, we'll they can come for a ride in my heap and I'll show them. YMMV. I would go with the GM Performance if I were to go buy another one. I'm pretty sure it's chinese made, but they got it right on this one.

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post #4 of 45 (permalink) Old Jul 5th, 19, 9:36 PM
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Re: Thinking of going from MSD to HEi

I took my MSD off this go round and just went with a std HEI. No issues, no regrets.
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post #5 of 45 (permalink) Old Jul 5th, 19, 9:45 PM
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My msd is 8 years old or so now. Still works great!
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post #6 of 45 (permalink) Old Jul 6th, 19, 6:29 PM
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Bill
 
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Smile Re: Thinking of going from MSD to HEi

Bought our 1st MSD-6 box in 1980. Lots of folks bought one just for MPG.

39 years & 30+ MSD boxes/distributors/coils & 20+ sets of plug wires,
never an issue has arisen...not one.
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post #7 of 45 (permalink) Old Jul 6th, 19, 6:33 PM
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Re: Thinking of going from MSD to HEi

My car has an MSD 6AL box, MSD "Blaster" coil and MSD distributor and I never had any problem with it. (everything was on the car when I bought it)

Claude.
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post #8 of 45 (permalink) Old Jul 6th, 19, 9:36 PM
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Re: Thinking of going from MSD to HEi

only problem i have had is the blaster coil leaking oil.

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post #9 of 45 (permalink) Old Jul 7th, 19, 10:54 AM
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Re: Thinking of going from MSD to HEi

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Originally Posted by chopperb View Post
only problem i have had is the blaster coil leaking oil.
There are known issues with the coils but someone on here has posted recommendations for quality coils that can be used in place of the Blaster. Might have been Dave Ray or maybe some with a screen name of "Ignition Man". Not sure of the names but I know a replacement, including I think a NAPA part number, for the Blaster was mentioned. Early Blasters are supposed to be OK...something about Federal regulations concerning what is inside the coil to help keep it cool. New coils are built differently and overheat then fail if memory serves well.

I have a vintage 1990's 6AL and MSD billet along with an O-L-D Blaster. It never has missed a beat. Cannot comment on improvements in ET and top speed cause I have no inclination to race the car. I will say that the car starts very easily and warmed up easier with the MSD than with a stock ignition. When I lived in New England I could start the car when the temps were 10 to 20 degrees (F) and just run back from the garage into the house while the car warmed up.
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post #10 of 45 (permalink) Old Jul 7th, 19, 12:17 PM
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Eric
 
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Re: Thinking of going from MSD to HEi

Personally I see no reason to run a box on the street, a simple HEI works fine.
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post #11 of 45 (permalink) Old Jul 8th, 19, 2:55 AM
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Re: Thinking of going from MSD to HEi

just do it.

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post #12 of 45 (permalink) Old Jul 8th, 19, 6:28 AM
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Re: Thinking of going from MSD to HEi

I removed an entire msd setup - box and billet hei and installed the distrib That Tom linked. Didnít notice even a HAIR of difference anywhere. Save your money

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post #13 of 45 (permalink) Old Jul 8th, 19, 7:09 AM
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Re: Thinking of going from MSD to HEi

Years ago my MSD quit in my 64 Pontiac right before a car cruise, so I put the stock single points distributor and coil back in, wired it up to the factory resister wire, set the timing and left. I noticed how much faster it started and it was running better with a heavier exhaust note. I never replaced that MSD and just ran the stock points distributor after that and never had any issues..
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post #14 of 45 (permalink) Old Jul 8th, 19, 11:27 AM
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Re: Thinking of going from MSD to HEi

I have the MSD Digital 6 plus on my Chevelle with an HEI MSD distributer (coil in cap). I keep the HEI insert module for the distributer in my trunk to quickly convert back to HEI if the MSD Digital 6 plus fails. The MSD digital 6 plus has failed on me a couple of times through the last 10 years or so, but, I keep going back to it from the HEI because of the multiple spark. Bottom-line, I can just get my big cam Chevelle to run cleaner and more efficient with the MSD digital 6. The box just gives you that extra energy to really clean up your idle and low load conditions.

Bottom line for me, the MSD Digital 6 plus is not very realiable, but, has a great multi-spark that I really like. The HEI is very, very reliable, but, I miss the multi-spark with my big cam.

Harry
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post #15 of 45 (permalink) Old Jul 8th, 19, 12:41 PM
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Re: Thinking of going from MSD to HEi

I run a Chevrolet Performance HEI and have never had an issue. I have thought about going to the MSD setup but for now going with the "if it ain't broke don't fix it" philosophy, which I rarely utilize, I love buying new stuff

MSD quality now a days seems to be hit and miss. Some have no issues others have nothing but headaches. Good ole HEI seems pretty solid.
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