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post #1 of (permalink) Old 01-16-2005, 08:26 PM
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cylinder head qeustions

I have a stock 1980 258 Auto. Have been hearing a fairly loud pecking coming from under the valve cover. I took the cover off and started the motor to watch it. The #1&#2 cylinders first rocker arms moved about half what they should. The #2 rocker arms moved very slightly if any at all. The 3-6 cylinders seemed fine. Does anyone have any ideas about what might be wrong and how to repair it? Any help would be greatly appreciated. Dave
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post #2 of (permalink) Old 01-16-2005, 10:38 PM
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Re: cylinder head qeustions

Hows the oil presher? The 258 has hydraulic lifters and on my Chevy when the pump was going out the window it would not pump up the lifters all the time and would click loud.

Or they could just be going bad..
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post #3 of (permalink) Old 01-17-2005, 08:03 AM
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Re: cylinder head qeustions

While the engine is running push down on the pushrod end of the rocker arm. If it still doesn't move as much as the others you have a flattened cam lobe. Only cure is to replace the camshaft and ALL lifters. A fair amount of work, and a sign that it's time to consider an engine replacement or complete rebuild.
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post #4 of (permalink) Old 01-23-2005, 03:00 AM
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Re: cylinder head qeustions

I did not try to push down on the rods. But it is hard to understand it's that bad with know missing,no smoke,no loss in power, but bad milage if this info helps more Thanks David
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