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If these were both stock something was seriously wrong with the ls1! Ls1 dyno mostly around 300 to 320rwhp in the six speed version. Lt1 are more like 220 to maybe 240rwhp.
I saw an automatic LT1 with just a cut out and tune put down close to 260whp on a dyno today where intake/exhaust LS1 were putting down 285whp.
This might be a freak LT1 but I think a lot of the time they are very underestimated.