Look at my dirty, dirty pistons. And head!

Stokestack

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Hi all.

Finally got the driver's side head off my '96, to fix a failed helicoil repair for the ol' blown-out-plug defect. I need to ream out the hole and put a Time-Sert in there.

Meanwhile, though, would anyone like to weigh in on the condition of this engine? Obviously the surfaces are caked with carbon and gunk, but I'm intrigued by the differing condition of the cylinders. The front two have flaky deposits in the center of the pistons, whereas the back two are more evenly coated.

The #6 cylinder (second from the left here) is the one that stopped firing.

What's a safe way to go about cleaning these surfaces?

Thanks for any insights.

LH pistons and head.jpg
 

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