My bus had issues with the starter hot soaking, as I used the original Chevy starter in the bellhousing along with redrilled flywheel behind the Cadillac V8, and its exhaust manifold configuration put that pipe pretty close to the starter. I ended up alleviating most of my problems when I made it electric fan cooled. Since those fans always came on for a minute after engine shutdown, they'd blow cool air across the whole exhaust/starter area and that seemed to make my solenoids last years instead of months.
I could see this fancy computer controlled unit being electric fan cooled, so maybe that will be the answer.
Also, I'm quite sure I've never seen the like of that head before on any stovebolt six!
