I know this is a Magnum thread, so I'll just say the only 5.3's I've seen go fast were on boost or bottle. But if you pull a 4.8/5.3 out of a Tahoe and ONLY add a cam and headers, you are welcome to come and race the 6.2 LS that's sitting in my driveway that has just under 500 hp. You should be able to go toe to toe... :)
