I just had to take pics of this and post.
What some people do to cheap out on a build.
Take one Honda D16Y6 block and add a cheapskate and mix in one 4" side grinder.
The HG surface of the block, Keep in mind this engine runs a factory MLS HG.
So I get the block set up, and leveled the best I could.
I spray the block deck with blue lay out dye.
My first pass is .0005, just to check set up and level.
I have checked for a front to back taper, about .005
Set up is good, lets see how bad it is.
Cut .0015 total .002
Cut .0015 total cut .0035
Cut .002 total .0055
Cut .0025 total .008
Its coming in, but it is still has low in spots.
After cutting a total of .012 this is what I was left with.
He has a coolant leak into #4 cylinder, and a miss on 2 others.
He chose this weapon to clean his HG surface because he was having a few issues with HG residue and was in a hurry.
This should help the compression some.
So the moral of this story is... Do not
clean your head gasket surface with the same equipment you use for smoothing welds!