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Author Topic:   Carbon build-up???????
posted April 05, 2002 09:02 AM
Small block 351w Ford street stock motor, stock heads, cast iron intake and exhaust manifolds, had bad carbon build-up on piston tops and in combustion chamber. Exhaust ports were also filled with carbon, but was kind of sticky.

What is the cause of this?

Please help.

posted April 05, 2002 10:00 PM
Poor ring seal , bad valve guides , bad valve stem seal's , worn out bore , or a combination of everything listed .

posted April 05, 2002 11:24 PM
The carbon is coming from burning your oil. Look for how it's getting into the cylinders, common sources are as sdhnc29 suggests.

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