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Excessive carbon buildup


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I pulled my l20b head to have a little looksie and I curious if anyone would call this exessive carbon buildup. The tops of the pistons look about the same.


<a href='http://i.imgur.com/dM2OgmN' title=''><img src='http://i.imgur.com/dM2OgmN.jpg' alt='' title='Hosted by imgur.com' /></a>


I bought this engine clean as a wistle, freshly painted, but a few things didn't add up, like missing exhaust manifold bolts and a beat up oil pan. I don't know if I should go any farther freshening it or just bolt it back together. The bores look smooth, with only a little bit if a ridge at the top of cyl 1.

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For future reference, You can clean off a lot of carbon from inside a running engine by feeding a LITTLE water in it.


Yup. Get the motor HOT even put cardboard over the rad. If you have a header open it. Rev the motor and begin pouring a pop can of water into the open carb, slowly at first. The motor will slow down from the cooling effect so rev it more and continue pouring. The sudden cooling and the steam generated will flake the carbon off. Let the motor recover it's heat by idling. When hot do again. The combustion chambers will steam clean just like a blown head gasket.

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