This is how I cut the broken bolt hole.
Another view from the front.
Looking from the TOP, the bolt hole cut down the middle, you are looking at the lower portion .
Then I cut this in half, there is a water jacket, the jacket is in the inside part of the bolt hole...
My advice...
@DieselAmateur I'll see if I still have cutaways I did years ago. I also still have 1 scrap head I can section in that area.
The thing with welding or brazing is the heat may bother the head gasket ...
The M255HV294S is used in the P400's due to the different oil flow in the girdle compared to others.. ... The spacer is machined for even taller gears.. I shim the spring a bit myself...
The only wet hole is the d/s lower hole, you can feel this with your finger inside the hole... the others are blind holes, if you pack sealant where it isn't needed you could push the bottom of the hole out and damage the block...
You can match that little bit and grind it if you want, if you line it up before tightening the bolts it won't be like that.
As for the w/p's, this is how to tell a higher flow vs a standard flow pump tight is high flow, a gap like the flowkooler is lower flow...
FYI, flowkooler now has one...