On my new setup, after talking to may people and Wiseco, we went with 0.0055" piston to bore wall. My setup is in my sig. We will be heating the engine (oil and coolant) to 160* before each startup and using the LSX block. One thing they did tell me that they would have recommended .005" on my setup if I was using an Aluminum block. (1500hp goal) To be totally safe on mine (wider than called for), we did .030" ring gap.
Some things to think about are what your doing with the engine (street/race/hot lapping?)... N/A or power adder (sc or turbo), high or low IAT's? (W2A or no intercooler), how much boost and what fuel? Get a list together and call JE Pistons tech line. Tell em all the details and they should be able to get you close (the card that comes with the pistons is only for reference in my opinion as there are many assumptions made to come to those tolerances they give), but the .005 talked about by others should be close/safe/in the ball park.
Last edited by BMF_Racing; 03-05-2013 at 12:57 PM.