the 6AL has a rev limiter.

 

Yes, I realize there is a rev limiter but will it increase performance?

 

any capacitive dicharge will increase performance but contrary to popular belief is the fact that MSD only provides multispark discharge at lower RPMs.
ie at idle etc.
otherwise itll provide 1 spark per ignition cycle.

 

To expand on what Dawg stated...

MSD provides a spark for 20 degrees of rotation. At lower rpm, you will get multiple sparks during that 20 degrees. At higher rpm, time becomes an issue, and you won't get multiple sparks during that 20 degrees (the piston is just not there long enough to produce multiple sparks) However, the MSD unit will continue to make sure that it does provide a spark for those 20 degrees, its just one longer lasting spark.

Also remember that the MSD unit will provide a higher current to the spark plug, compared to a traditional system.

So, MDS = better performance over all. Get the AL for the rev limiter.

 

would the digital E msd be a choice also?

 

Heck no!
I bought digital E curve distributor in spring 2008 and it left me stranded 125 miles from home.
had it RMAed and failed again last week so its going back.
note: first RMA they gave me a new one.
ill still to my mallory unilite distributor.
Its been faithful for 20 years now.

 

What is the digital E?

 

I suggest you look at Mallory's HyFire VI. It has about every option you require for future needs and is a Multi-Spark Unit.

Has Spark Retard for StartUp below 100 rpm
Rev- Limiters for Main Advance, Optional Retard Unit, NOS and MAP Spectrums ... etc
Mag Trigger Ignitions
Tachometer Calibration.

Will work with Points, MBI, Optic and Magnetic Trigger Ignitions.

Digital Panel Interface

I've been using one for 4 years with the Mallory MBI Distributer and like it.

 

One other consideration not mentioned, is that with a stock HEI distributor (I know you have the MSD street distributor) that is reved above 4700 RPM, the power running through the ignition module gets it so hot that the transistor inside break down. The inductive ignition system then sputters and drops cylinders at high RPM which looses horsepower to the rear wheels. Run it had enough, long enough, and it will burn up; as it can not shed heat fast enough through the amount of contact area allotted to the stock module. (The factory thinks that the heat conducting white paste is expensive, and never uses enough to get full coverage of the bottom of the module).

You do not have that issue with a capacitive discharge MSD as it works at full power all the time and is designed to shed any heat build up. At low RPM the power is spread out over multiple strokes, but the same power fires a single stroke at high RPM every time with no dropped cylinders (unless it hits the soft rev limiter).

Big Dave

 

I have the 6al and really like the Digital 6 for all the options and no "pills" to change...and yes I did see a change (for the good) just make sure you have good wires.

 

I was under the impression that the 6AL doesnt have the rev limitor and 6A does.

Go get the 7AL +

 

No, the 6AL has the limiter, that is what the L stands for (limiter).

I was under the impression that the 6AL doesnt have the rev limitor and 6A does.

Go get the 7AL +

 

this is what i have found with my msd. it starts quiker, shuts off better ei no engine run on but it made absolutely no difference in 1/4 mile time. drivabliity was better though.

 

MSD ignition boxes are very sensitive to voltage spikes (the transistors inside are easily fried if you feed in too much voltage) a voltage spike can be created by a corroded battery terminal a defective alternator (with an internal voltage control module), or a number of other causes.

Larger Dave

 

Would you not recommend one?