Which one would be better? I've heard two different stories about both. Some people tell me that a high volt coil and a good module will do. Others say that MSD is the way to go. Have you added any of the following and seen any difference?

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1979 - 305ci
Holley 750cfm Vacuum Sec.
Edelbrock Performer Intake
Summit 48,000 volt Coil

Do a search I was having many problems That I thought were ign related. Bottom line the Hei system was not the problem and It was working. I guess what I'm tryin to say;If you present system works good dont mess with it . you wont see any performance gains, and you cant beat the reliability and servicability of HEI.

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67 prostreet BB Camaro
71 BB SS Chevelle (clone)
2002 35th anniv SS Z28 conv.

MSD. I dont think you'll regret it.

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Black 69 camaro

Try performance distributors DUI, a form of HEI, they curve it specifically for your engine, and it doesnt have the cost like MSD does, and MSD doesnt make more power. www.performancedistributors.com (http://www.performancedistributors.com)

Street-HEI, strip-MSD. If you miss a shift it's nice to have a limiter.

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Steve

I recently went from HEI to MSD and it was like a completely new engine.My 355cid loved it.The same guys I was running neck and neck with, I then started pulling away at the line.You wont regret the MSD.JUST DO IT!

Things I observed when I added an MSD box to my HEI setup in my 355:

-Improved throttle response, throughout the rev range
-Car seemed to pick up low-end torque
-cleaner burning plugs
-better fuel economy (2 mpg)

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79' Z28...

MSD is the way to go

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68 Camaro 502/502 w/3.73
70 Monte Carlo 400 T400

This might sound kind of funny but i use both. I have an HEI distributer with the msd coil and ignition moduel and I use a 6al box. I just installed the 6Al and i have to say it is WELL worth the money spent the car fires up immeaditely and runs very smooth. You can tell the differnce right away. I disconected it and ran with out it for a day and hooked it back up it is like a totaly differn't car. I LOVE my MSD

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69 Camaro RS, 355ci, 71 gm heads 74cc 1.72in 1.50ex,mild cam, Preformer rpm intake, edelbrock 600 carb, 350 turbo w/ shift kit 2500 stall, 12 bolt 3.55 eaton posi..

There is a test in the installation manual for determining whether your MSD is working. For grins, do the test. The spark generated is HUGE - at least 3-4 times larger (wider) than the spark with a stock ignition.

Like 69CamaroRacer, I use both. It is a completely stock GM distributor that I shimmed and put a bronze gear on for my roller cam. On the top side it is a stock replacement cap, coil, and rotor. The HEI module has been removed and the stock magnetic pick-up is used to trigger an MSD Digital 6, which is a very nice piece BTW. See sig. for performance.

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Jason Gore
AKA DragRacer
383 SBC Powered '71 Chevelle
1.60 - 60'
7.37@93.23 - 1/8th

[This message has been edited by DragRacer (edited 07-10-2002).]