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Hey, what's making all this smoke? 200 1980

posted by  someone claiming to be hillbilly on  Sun Jun 2 02:03 CST 2002 [RELATED]

I have a 68 chevy pickup 250 straight 6 (I also own 6 Volvos). Every time that I would go down the mountain (Hillbilly) and gear the truck down for a mile or two, it would puff blue smoke at the bottom upon acceleration. Compression checked out OK, so I figured it must be in the head. Turns out the valve guides and rubber seals were worn. I replaced the guides and seals and eliminated the problem. If your engine was rebuilt, it is possible that the existing guides were knurled (deformed inside and re-bored) instead of being replaced. In my experience, knurled valve guides do not last as long as new guides. Unless you are equipped to change the guides, you will have a machine shop do the work. (You can take it off yourself to save $$).






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