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Okay, so I have been doing a LOT of reading on this site and others in regard to engine performance, upgrades, power and drive-ability for my Silverado SS. Quite frankly there is SO much information it can be quite daunting and confusing for someone such as myself; as I am a do-it-yourselfer with little knowledge in what I am looking to do. So please bear with me. My truck is a 2003 Silverado SS with 62,000 miles. It is in near perfect condition, always well maintained and has been stored in a climate controlled garage for the last 5 years or so. I do NOT drive it everyday. The only current modifications are: Long tube headers Custom 2 1/2 Borla Dual Exhaust (with X-pipe) Cold Air Intake. To make a long story short, I want more horsepower and Torque. I would love to have somewhere between 550-600hp at the crank with respectable torque numbers. I am considering the following: 421CI 4.03 pistons -11cc Dish 6.125 Crank 247cc,68cc heads cam choices are as follows: Intake Duration 212 224 216 Exhaust Duration 218 230 220 Intake Lift .558 .581 .56 Exhaust Lift .563 .591 .56 LSA 115 114 114 2800 Stall (?) What do you all think? Is 550-600 hp achievable on this setup naturally aspirated and yet still be able to put on a supercharger at some point in the next few years without going back in to the engine? Please keep in mind that even though this is NOT a daily driver, it still needs to be considered a daily driver. I don't want some crazy lopey engine. I need to be able to jump in it and drive it across the country, or pull a small trailer (6 1/2 ' by 12 ' single 3500lb axle) or my wife needs to be able to jump in and drive it to work, etc. It will likely never see a race or drag strip. I have considered putting on a Radix or Whipple on the stock 6.0 instead of building an engine. However, I just don't believe I will be satisfied with the outcome. Your guidance is really appreciated.