MSD distributor tuning

I’m not a fan of using two different springs on a GM style advance. It causes wear and it makes things wonky.

I’m not a big fan of using real heavy springs either.

I’d get the initial up to 20 and it might take 24. That means you’d only need 10-15 degrees of mechanical advance to get 34-35 total.

If you get that much initial, you have to bring the curve in pretty slowly. If not, it will rattle. To get there, you either need big honking heavy springs, or you can shorten the advance weights. Then it’s a matter of getting the right springs with the shortened weights.

All engines want a timing curve. All of them. Most engines want less timing at peak torque and more timing at peak power. So if you start out with 20-24 initial, you need to make sure the timing doesn’t start moving until 2k rpm or close to it. If you don’t delay the start of the curve, you’ll have too much timing at peak torque and it will kill torque and power.