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When did FORD improve 4.6/5.4 heads?

 
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Old 11-12-2011, 07:59 PM
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My 99 E-350 has 146,000 on it, the 5.4 had the plugs swapped at 97,000 miles, I've not had one issue with them yet, but MPG has greatly deceased lately.
 
 
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