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Author Topic:   Carbon build-up???????
Dirt Maniac

Total posts: 113
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.

Dirt Freak

Total posts: 467
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 .

Dirt Full Roller

Total posts: 51
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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