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Newer engine designs?

KDIXER

Full Member
Joined
May 11, 2006
Messages
87
What exactly is GM changing to up the horsepower of the newer 5.3L engines? If it is redesigned parts, are they compatible with the older 5.3's?
 
In some cases, it's merely a software change in the PCM.  The change from mechanical to electric fans, for example, was worth a few hp on the rating with no other changes to the actual engine.
 
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