That's interesting for sure... I have noticed these magnum engines the timing jumps all around at idle, every one of them jumps continuously around 5 or 10 degrees just sitting idling, I wonder if it could somehow stabilize that? It shows up both with a timing light and on the scanners data stream on every one of them.
I have seen the timing jump your talking about on LA engines with worn out timing chains.
Never put a light on a magnum engine though since the computer controls it all.
I wonder if a timing chain tensioner would correct most of it?
