are 12a and 13 dizzy the same
 

working on prepping my first 13b engine...
wondering if i can use the same dizzy...:scratch:

thanks in advance!

I'd say that's a question for j9fd3s since he seems to have all of the parts microfiches. If they have the same part # then it would be safe to assume they are the same. I suspect that there is a difference though. I vaguely remeber there being a 5* difference in the trailing timing marks of the 12A/13B timing pulleys, but don't quote me on that.

The Machanical advance curve is a little different.

Yep. Either will work just fine. The advance curve is a bit different between the two, but I doubt you would ever notice. Currently running a 12A dizzy on my GSL-SE. It has been like that for about 12 years and no problems at all.

any disadvantage to using the 12a dizzy on 13b?
if remember right, the trailing timing has a mechanical adjustment(manual tranny only...)

not sure if it matters, but my 13b is an rx4/repu engine...

also, can i use my OMP from 12a(1983)
on my rx4 13b?

yes and yes

sweet!
finally, an answer that doesnt cost $500+ :LOL:

make sure you adjust the omp for the right flow, check the manual. I would premix until you "know" it is right on the money.

yep, dizzy's work the same, except they have slightly different advance curves, depending on the year/model.

the curves are in the FSM

From 84 FSM.