Quote Originally Posted by SubGothius View Post
Well, it is exactly 180 degrees, but with the odd number of gear teeth it results in your ign. timing being a half-tooth too advanced or retarded no matter how you insert the dizzy, with not enough range in the advance adjustment to bring it right. This can happen if you rebuild the dizzy with either the drive gear or the mechanical advance mechanism wrong way around.
hmmm, the issue is that the distributor hasn't been moved since before this issue arose, when it was working fine. is there a way to tell whether this might be a problem, without disassembly?

you do bring up the mechanical advance again, and remind me of that issue. there has been a debate about whether the 2nd gen trucks have a mechanical advance. when i connect the jumper that cuts out the computer for the timing, there is zero advance with increased revs, even with engine racing. if anything, it very slightly goes towards zero/to the right, about 1 degree or so (i think this might just be that everything's moving so much faster).

can someone 100% confirm whether their 2nd gen truck shows any advance with the jumper set?

that would be amazing, thanks!