Not Ranked
When a power valve "blows", it's always open, causing a rough idle because of the extra fuel. The engine will run fine at other times. I've tried sucking on them as a test without success personally, so I'm resigned to replacing them if the idle is as described. Oh, by the way, a catalitic convertor will turn a nice cherry red because of the extra fuel. Spectre makes a power valve saver for around $10 or so, and Holley sells a 2-pack for around same price, although the Spectre unit is just a bit easier to install.
Dan
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Do you know why they call it "PMS"? Because "Mad Cow Disease" was taken. --Unknown, presumed deceased
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