Do you have used cats on it?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Is it overcammed. 222/226 on 113. 596/597. Stock verter
Id like to edit an earlier post. It is real soft down low but pulls super hard after 3k. So hard it lifts the front end and i lose a little steering feel. SKETCHY!!
You need a stall convertor, maybe 3600+ RPM.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709