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Old 07-11-2008, 04:40 PM
piniongear piniongear is offline
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I need some help with my 350 Chevy engine...

My first post after doing my intro.
The problem:
I purchased a 350 rebuilt engine 3 years back for my 1992 Chevy van.
After 15K miles the engine suddenly developed a knock. The knock occurs when the engine is just beginning to shift into second gear.
The engine burns no oil and runs and starts well.
I removed the engine and have begun starting to take it apart.
So far I have found no problem except for one thing:
Cylinders 2 through 8 had spark plugs that looked white and clean.
Cylinder #1 had a jet bleck spark plug.
After I removed the heads I saw that cylinders 2-8 had identical brown color on the exhaust valves. Cylinder #1 all valves are jet black.
Cylinder walls look OK, but I have not removed the pistons and rods yet. Engine is very clean inside. No sludge, metal particles or any sign of damage anywhere. I removed the oil pan and all looks OK there as well.
Anyone have an idea of what I need to look for to ID this knocking? I really am in need of help
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