Any Chevy engine, if it's well-modified or just slightly warmed-over, requires a good set of valve seals. Originally, a small rubber O-ring, fitted in the second valve stem groove, served as the only ...

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Question: We have a 1994 Dodge Grand Caravan with the 3.0-liter engine. We have been told that the rubber valve guide seals have dried out, which is the reason for the constant smoking after start-up.