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The oil return holes in the head are probably blocked with sludge.The oil goes 2 the front valves & is sucked into the combustion chamber via worn valve stem seals. ----------------- Most likely it's worn valve seals and valve guides. If your oil returns were blocked, then you would have serious valve cover leaks on a 1984 350 chevy. Chances are, you get a puff of smoke upon the first startup of the day as well.

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โˆ™ 2007-03-15 09:19:44
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Q: When you come to a stop light in your 1984 GMC truck with a 350 the right side exhaust smokes for about 30 seconds what can be wrong?
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