Did you read the plugs as they came out? Look for one with deposits on the electrode, indicating a leak. You could be leaking coolant under a head gasket under pressure, and still have good compression. The heads at least need a freshening, there is a 25# difference across the readings. No big deal, but since your doing something..... Ray On Jan 8, 2012, at 7:30 PM, Matt Allyn wrote: Verdict is not good. I pulled the spark plugs and conducted a compression test. The readings are as follows...which lead me to believe it the block itself: DRIVERS SIDE No. 1 = 175 pounds No. 3 = 160 pounds No. 5 = 160 pounds No. 7 = 165 pounds PASSENGER SIDE No. 2 = 150 pounds No. 4 = 172 pounds No. 6 = 163 pounds No. 8 = 165 pounds Time to pull ye old block. Oh the joy! [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylangYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/