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Old 10-18-2008, 07:57 PM
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flat lobe?

I think I might have a flat lobe. I was adjusting the valves and it exhaust in the rear cylinder does not seem to move as much as the other. I don't know if you can tell when manually moving the engine? It is a hydraulic flat cam 480/494 228/234. could the lifter just not be pumped up? The car runs grate it just has a slight 25 rpm surge at 850 and the vacuum is not steady reeds 13-12.5. Put my mind at ease.

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Old 10-18-2008, 08:11 PM
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A quick ck is pull the dip stick and look at the oil in the sun. Sparkely stuff means it's got metal flakes in it. You can also pull the oil filter and cut it open and take a look. Last is to use a dial indicator on the rocker to see what it's doing.
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