I have a stock cubed LS1 (346) w/ 90k miles and i had the cylinders honed and cleaned. Having the miles it has and with the honing , the machinst told me the walls have increased in size by just a little bit. He told me to get a set of file fit rings, which i did from speed pro (R-10598 13mm). The package came with instructions on how to file fit them, but the instructions are coming off of a 4.00 bore piston, i have the stock 3.89 size but a speed-pro forged piston, so its a little thicker due to the coating, but not that much thicker. I am wondering what should be my piston ring gaps??? I plan on using nitrous at times. Any insight would be helpful!!! thanks