Originally Posted by 68NovaSS
I read in several threads here that some timing lights aren't compatible with MSD ignitions, check it out. MSD reps on another forum say digital and dial back lights aren't accurate with multiple spark ignitions. If using a dial back light, is it zeroed?
I have read they have trouble reading the multiple sparks of a msd box, but all i have is the msd street fire hei. I also used a stock gm hei off of like a 85 chevy truck or something like that with the same results.
With the dial back lights, I set them on 0 and used the tape I put on the balancer and I set it to 60 and got the same thing. I think actually what i'm running now is 56 at idle with vac unhooked and plugged. My uncle has a regular non dial light that i am going to borrow next weekend. I just don't see 3 lights all being off that far and by the same amount.