the lt1 motors are pretty powerful. i got my caprice which is a very heavy car (4400lbs) with 3.08 gears to run a 14.2 with a completely stock motor and with a 100% stock motor with 3.73s i ran a 13.8. I'm ready to do some stuff to the motor but i dont want to take it apart since it runs soo good doesnt burn a drop of oil at 122k hard miles (ex cop car)