VT LS1 Engines

[Jayme]

Hi, im just looking through some of the stock LS1 calibrations and I was wondering... in a VT, what exactly is the difference between the LS1 in the HSV's and the LS1 in the executive? in the calibrations, the HSV has 6-10 deg more timing at WOT than the executive by the looks of it, is it just the tune only that gives the HSV more power? is that what people do? flash a HSV tune onto an executive as a base and tune further from there? or are there actually engine differences ?

[The1]

Factory HSV would have to have extractors and better exhaust then EXEC? Anyone know what got added? I wonder if there were HSV Enhanced VT's with LS1's?

[Doctor Bob]

yeah clubsport, senator etc, it was just the cal & exhaust & airbox that was different, they usually run them pretty rich too