BX23 head diyer machinists?

[tshep]

Please check out post in repair forum,
BX23 head pics

BX23 head DIYer, machinists?

Here are 3 pics of my 3 different combustion areas. Each seems to have.... A same size line, then a stake point, middle flute of precombustion chamber? OR exactly the same crack. Assuming these are assembly marks, what is a good homebrew/DIY crack detection method? Or, not finding any, do I...

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THX!