My old pickup was a cam only 5.3 with a 3600 stall and a 175 shot of nitrous. Made well over 500hp and ran the 1/4 in 12.1 seconds, spinning though the 60'. They are a little pricey to hop up, but they're unstoppable. The truck had 175k+ on it and had no issues with all the mods. You could pick up a stock 5.3 for $400 and make 250whp and get 18+ mpg. Not at all trying to derail your thread or one-up, just talking car with a fellow enthusiast!
What sized cam you have in there? My 5.3 Silverado I have a small cam and 3200 stall with a tune. Back when I had just the tune it made the engine seem so much better than stock. Quite a few 'nannys' from the factory. It still pulls strong at 225k miles.
I've been itching for a 6.0 build.
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