Which MSD ignition?
 

Im going to be running a 347 engine with about 100-125hp of NOS and I was wondering what MSD ignition would be best I see the 6a series with RPM limiting and also noticed the 6a BTM made for cars running boost which allows you to retard the timing, what do you guys/gals think?

I bought 6AL and it started acting stupid after about a year. Sometimes the car will crank, sometimes it wont. I am going to look into another ignition when I rebuild my 90.

I'd go with the 6BTM. Check it out first thought, cause I'm not sure what the difference would be for boost and N2O as far as ignition goes.

ive seen no problems with my 6al and i have the add on to adjust the timing from the inside i havent looked up the prices to see which route would be cheaper but mine works just fine

Re: Which MSD ignition?
 

If you plan to spray it, use the Digital 6 box. It has the rev limiter plus a timing retard for nitrous. Don't forget the window switch.

Which is the digital 6, on the MSD website theres alotta 6a versions

http://msdignition.com/images/6520.gif

that is the digital 6. its listed under products and then under drag racing on thier site.

Thier site doesnt direct link so you have to do that

I got it thanks, Digital-6 plus ignition control PN 6520