Allen's was right around 3800 with the LS1. If you got an LS2 then you would have 6.0L and lightweight aluminum. My next setup will probally be LS2 based. My Mom has a 2002 Trailblazer that wants an LS2 real bad! Just dreaming! BTW you will love having an older body truck with new power plant. It really turns heads! 
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
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