Which MSD pro billet should I go for? - Chevelle Tech
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post #1 of 21 (permalink) Old Aug 12th, 19, 6:39 AM Thread Starter
 
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Which MSD pro billet should I go for?

I have a 402 bbc fairly stock with a mild cam. I currently have a HEI set up and wanna upgrade to MSD pro billet. Should I go for the MSD85551 mechanical advance or the MSD8361 vacuum advance and why?
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post #2 of 21 (permalink) Old Aug 12th, 19, 7:03 AM
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Greg
 
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Is there any particular reason you are taking the hei out?
Are you putting an MSD distributor + an ignition box or just a all in one distributor (forgive me for not looking part numbers you gave up lol)?
If you’re driving on the street, get vacuum advance, tune it right, and you’ll be happy. Or, leave the hei, tune it right, and you’ll be happy with a lot more $ left in your wallet!!

Greg C.
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post #3 of 21 (permalink) Old Aug 12th, 19, 7:06 AM
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Guy
 
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Re: Which MSD pro billet should I go for?

Well,you're asking to open a can of worms here LOL
Some will tell you to stick with the HEI,others will tell you to buy the GM Performance model,and some will give you other advice.
I have in the past used this MSD distributor,# 8365;
https://www.summitracing.com/int/parts/msd-8365
It had a real nice mechanical advance and IIRC it came with a couple of sets of springs and bushings for tuning.
But,the coil died after less than a year,I replaced it with an old Proform one that worked great;
https://www.summitracing.com/int/par...943c/overview/
Then the module died.
I wasn't impressed with the electronics but the distributor itself was fine.
Guy

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post #4 of 21 (permalink) Old Aug 12th, 19, 7:45 AM
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Rick
 
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Re: Which MSD pro billet should I go for?

HEI has been one of the best systems for decades. Long before MSD and the others. If you have a good one I'd keep it.
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post #5 of 21 (permalink) Old Aug 12th, 19, 11:32 AM
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Re: Which MSD pro billet should I go for?

I have the GM Performance rebranded, and much cheaper, version of the Pro Billet HEI. It has everything that the MSD has except rev limiter. I limited the vacuum advance to 14 degrees and have the 18 degree bushing and I'll eventually get around to remote mounting the coil. It's a good unit, really needs no upgrades.

My very amateur opinion of CDI boxes is that unless one is required to control nitrous, boost or other stuff I'm not familiar with then they just make your car heavier and your wallet lighter, not to mention add complexity and make troubleshooting more difficult. An HEI module seems to do every bit as good and keeping a spare in the car just in case is cheap insurance. But if you move the coil out of the cap it's been said that the modules last indefinitely.
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post #6 of 21 (permalink) Old Aug 12th, 19, 11:51 AM
 
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Re: Which MSD pro billet should I go for?

Just be sure to replace the gear before you run it.
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Chris Straub
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Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
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post #7 of 21 (permalink) Old Aug 12th, 19, 4:56 PM
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Re: Which MSD pro billet should I go for?

VACUUM ADVANCE, because it will work right after you set up the vacuum advance degrees stop correctly (easy to do). DO NOT FALL FOR THE ABSOLUTE INSANITY OF LOCKING THE MECHANICAL ADVANCE OUT, EITHER, leave the curves in place. Run the vacuum advance on full manifold vacuum only (this ois the reason to stop down the vacuum advance degrees, to get 22 to 24 IDLE timing degrees (Initial and vacuum advance degrees combined, example: INITIAL, 16, VACUUM, 8 total IDLE degrees 24)
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post #8 of 21 (permalink) Old Aug 12th, 19, 5:01 PM
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Steve
 
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Re: Which MSD pro billet should I go for?

Do you have a part number for the GM Performance rebranded distributor? Sounds like a bargain...

Quote:
Originally Posted by Tommy the Cat View Post
I have the GM Performance rebranded, and much cheaper, version of the Pro Billet HEI. It has everything that the MSD has except rev limiter. I limited the vacuum advance to 14 degrees and have the 18 degree bushing and I'll eventually get around to remote mounting the coil. It's a good unit, really needs no upgrades.

My very amateur opinion of CDI boxes is that unless one is required to control nitrous, boost or other stuff I'm not familiar with then they just make your car heavier and your wallet lighter, not to mention add complexity and make troubleshooting more difficult. An HEI module seems to do every bit as good and keeping a spare in the car just in case is cheap insurance. But if you move the coil out of the cap it's been said that the modules last indefinitely.

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post #9 of 21 (permalink) Old Aug 12th, 19, 5:41 PM
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Tom
 
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Re: Which MSD pro billet should I go for?

I'll look through my receipts. A quick Google search didn't yield anything. Maybe they aren't selling it anymore.

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69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #10 of 21 (permalink) Old Aug 12th, 19, 7:50 PM
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Tom
 
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Re: Which MSD pro billet should I go for?

Quote:
Originally Posted by lucifershammer View Post
Do you have a part number for the GM Performance rebranded distributor? Sounds like a bargain...
This is the one I have- https://www.jegs.com/i/Chevrolet-Per...61867/10002/-1


I paid $262 in March 2016...not sure what happened to the price since then!

70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #11 of 21 (permalink) Old Aug 12th, 19, 8:03 PM
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Steve
 
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Re: Which MSD pro billet should I go for?

It went up! Lol

Thanks for digging it up though.

Quote:
Originally Posted by Tommy the Cat View Post
This is the one I have- https://www.jegs.com/i/Chevrolet-Per...61867/10002/-1


I paid $262 in March 2016...not sure what happened to the price since then!

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post #12 of 21 (permalink) Old Aug 12th, 19, 8:36 PM
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Re: Which MSD pro billet should I go for?

Out of the 3 MSD distributors I have both ready to run have failed. The third is used just as a trigger only with a 6A box and it's the only one that is still working.
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post #13 of 21 (permalink) Old Aug 12th, 19, 9:41 PM
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Re: Which MSD pro billet should I go for?

Here is my problem. I had a BRAND NAME ign. system. ( my car is a driver) When it took a ... Be polite......A POOP...... You will say NOW WHAT! ( call a roll back!)
After one or two issues, I went to K. Ross Chevrolet and bought a H.E.I.
P.S. That was 39.000 miles ago. I do know the G.M.--H.E.I. is still in the 468, Because I looked and I saw it today.
Other than a race car, Or trying to beat " John Force " The G.M.--H.E.I. is the cats MEOW !
Your car, Your Cash, Your choice !
Bob


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post #14 of 21 (permalink) Old Aug 12th, 19, 11:40 PM
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Re: Which MSD pro billet should I go for?

No, they haven't stopped selling it.

No, it hasn't gone up, it's gone down substantially.

https://www.summitracing.com/parts/ado-93440806

BTW, already has a Melonized distributor gear. One lasted 14 years in my 406 Chevelle, still running when I wrecked the car.

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post #15 of 21 (permalink) Old Aug 12th, 19, 11:59 PM
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Re: Which MSD pro billet should I go for?

C) None of the above.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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