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:grin:

Oooops. I think all 4.0 are HO heads. :D

The intakes apparently did something good around 1999 and added 10hp or so.
 

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Was that a head design change or just the introduction of MPFI? I was under the impression that the 4.0 head was designed after the 2.5 head which had much better breathing capability. I wasn't aware of any further evolutions in design. Impressions are funny things, though.
 
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