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LS1 is about 350 HP and i think it has an iron block

the LS6 is aluminum and has around 400 HP (i think)

bassicly, the LS6 is faster.
 

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53 Eldo, 54 CDV, 74 FWB 96 FWB (sold),1998 STS(sold), 03 ESV
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Wrong, both the LS1 and LS6 are all aluminum...

LS6 is faster with 400-405hp.
 
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