ignition assistance

Don't overthink the timing issues when dropping a 6-71 on a small mopar. There is no need for vacuum advance. Here's what I am running. I have a 8534 MSD dizzy locked down so there is no mechanical advance, a Blaster 2 coil and a 6AL box. This supplies lots of spark. I have it timed at 30 degrees of advance. I don't take anything out when boost starts to come in. You might want to start at 28 degrees of advance and sneak up on it after that to get the optimum for your setup. Just remember that spark knock is your enemy and will kill your pistons very fast with a blower. That's why you start conservative and sneak up on it. I went up 2 degrees at a time and when I started to hear spark knock I backed the timing off 2 degrees. I am at 4 degrees lower right now as I try other stuff. This is always an experiment with me. LOL

By the way, you are really going to have to under drive that 6-71 to get 4 lbs of boost. At one tooth under drive I am at 6 lbs in my 340.

Now my disclaimer. This is what is working for me, every blown engine is a little different and what works good for me may not work good on another engine. But it can be a good guide or starting point.

Jack