vacuum reading not steady

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SRT_DSTRHOLC

"There is never enough horsepower...."
Joined
Mar 20, 2008
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Location
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When I replaced my PV with a 4.5 I was able to get the needle to stay inbetween 8-9 but not dead on one. What would casue this? I saw some where that maybe bad lifters or bad lobe?
 

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