Uhhhh, guys?

I've got a question that I have a feeling I'm not going to like the answer to....

If you've got the injector and prechamber removed from the head, and are looking down the hole at the top of the piston....

What's the top of the piston supposed to look like?

Pictorial responses or links would suffice as well.

I may be doing an engine swap sooner rather than later.

Vehicle is an 87 300D Turbo, OM 603.960, build date 7/86.

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Just say "NO" to Ethanol - Drive Diesel

Mitchell Oates
Mooresville, NC
'87 300D 212K miles
'87 300D 151K miles - R.I.P. 12/08
'05 Jeep Liberty CRD 67K miles
Grumpy Old Diesel Owners Club