My '98 Trans Am, Automatic with 2:73 gears ran 13.17@106.49 1st time at the track on street tires! my only mods were: Lid, Ported stock MAF,and a Flowmaster. it was 55 degrees there were many others there running low 12's with bolt ons(headers & converters) so it is possible but I too have seen slow LS1's, some just seem slower but I have yet to see one here in Florida run less than 13.99 also I have yet to see one with less than a 100 mph trap speed even in HOT weather, not saying that they are not out there but if they are it's either the altitude or somethings wrong with the car!
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1999 Camaro SS / A4 / #0877 Best ET with only Mac's, Lid & 160* Thermostat: 12.73@109.15 New Mods: '02 LS6 Cam & Springs, LS6 Oil Pump & PCV System, Yank 2600 Stall Converter & LS1 Edit.
http://jayscustomrods.homestead.com/index.html
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