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Chevy/GMC Trucks \  2003 silverado SS Engine Question???

2003 silverado SS Engine Question???

Chevy/GMC Trucks Make Specific
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Notworking   +1y
Whats the difference between Chevy's 6.0L engine and HO 6.0L engine found in the SS? Different heads or cam? How do they get the extra 45hp? Thanks.
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