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Discussion Starter #1
Hey every one i was just wondering what my compression should be on my 6.5 it has a very poor start and i was wanting the compression test it before i start throwing any money into it. it also idles rough as well.
 

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R.I.P. Sam
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32,078 Posts
around 400 on a warm engine is good. approaching 300's is worn out. IIRC, no cylinder should be out more than 10%
 
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