Borescope pictures- serious issue?

[K4fxd]

Why do you say that. What should I be looking for. I thought detonation would show as some pits on the piston.

It does look like pits on some of the pistons, but since you stated sea foam was poured in the cylinders it could be droplets.

Pull the fuel pump fuse and crank it over for 5 seconds or so and look at the bad cylinders again. Check 4 and 6 after spinning it over.

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[CrackedHorn]

It does look like pits on some of the pistons, but since you stated sea foam was poured in the cylinders it could be droplets.

Pull the fuel pump fuse and crank it over for 5 seconds or so and look at the bad cylinders again. Check 4 and 6 after spinning it over.

I added some more pics with better resolution.

 

[Zrussian13]

If compression is good I wouldn't worry until it looks like this...

 

[K4fxd]

Looks mostly like carbon deposits.

Look at the porcelain on the center insulator on the spark plugs. Use a magnafing glass or a jewlers loop. If you see shiny specs it is detonation along with the carbon.

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