One of the easiest ways to squeeze more horsepower out of an LS1 is to run it at a cooler temperature.
Applications (GM 5.7L LS1, all transmissions) Chevrolet1997-2002 Corvette 5.7L LS11998-2002 Camaro 5.7L LS1Pontiac 1998-2002 Firebird 5.7L LS1GMC1999-2002 CK 15/25/35 4.8/5.3/6.0L