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Old June 23rd, 2011, 08:33 AM   #7
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The s's are 4's; I can't edit for some reason from my phone. The machine shop rebuilt the head for free the second time, so I am wondering if they put bad intake valves in the first time.

The engine is running cool from the gauge, new motorcraft plugs gapped properly.I had bosch plugs before, but those aren't gappable. Any other suggestions?
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