Its the LS with the ITR pistons, shotpeened LS rods, Micropolished & Balanced crank, the crower 62402-2's, b16 tranny with that awesome ACT 4 puck. Its pretty quick, this is the motor I want on the 125 shot. And yes, we lakelanders sometimes know how to piece together a motor that will run for about 500-2000 miles, and this one is commin up on about 600 miles now so watch out for another "new setup" soon