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V-8 Cylinder Head Interchange
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12-16-2006, 05:30 PM
Tomguy
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Join Date: Aug 2002
Location: near Scranton, PA
Posts: 5,407
The best upgrade to an older 4.5 (be it D-Jet or K-Jet) is to put on the correct corresponding 3.5 heads. Higher compression. Don't do it in a state that would still require emissions testing, though.
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