I stitch welded mine as per the diagram. I agree it is "just mild steel", but there is a lot of stress in that area already (hence the cracking from fatigue) I don't want to add to it.
Not adding extra stress is also the same reason that patch plate isn't just straight cut at the ends...
I did not weld prime the backside of mine, nor the bare steel frame it got stitch welded to. I also didn't seam seal anything. Priming between would have been a good idea.
Rene
Not adding extra stress is also the same reason that patch plate isn't just straight cut at the ends...
I did not weld prime the backside of mine, nor the bare steel frame it got stitch welded to. I also didn't seam seal anything. Priming between would have been a good idea.

Rene

If they are going to sell these things and market them for all blazers they should at least make 2 different verions. 1 with oil cooler one without. Or just make it work on the one with oil cooler and by default it will work without.