Update: got the engine torn apart. Cylinders must be re-bored, 6th had about 0,2 mm deep hole from corrosion.

E-mailed a machine shop about filling and grinding crank rod-journals to fit narrower rods, originals are very heavy due to "extra" oil channel and good build, and new ones that are 28 mm wide with correct big-end-bore are impossible to find.

Correct bore is hopefully going to be 86.5 mm, to have some room in the future if needed. I haven't evaluated the block that carefully, leaving it to the machine shop.

Pistons are going to be Ross, custom made, with design that rises the compression to about 10:1.

That's all for now, going to add pictures when there's a bit more progress.

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1980 280 C - dark metallic blue, AMG Pentas 16x8/9