Pssst.... I don't think you'd need to tweek that one. And if you need more power than that, and NOS!!! (Insert music in background: "Too Fast, Too Furious...")
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not to add fuel to the fire but I found a 1999 2500 6.0L Vortec literally down the street at Hillsboro wrecking for $1350 with a computer. They say its complete and runs well (93,000 miles) although they also say the compression is 150-190 (probably a blown head gasket?). I believe these are rated at 300hp/360lb-ft? What would it take to squeeze a few more ponies outta it? Is that the typical going price for them?
Gen III/IV engines have crazy aftermarket support. Really the sky is the limit. Stop by Barnes and Noble and take a look at How to Build High-Performance Chevy LS1/LS6 V-8. It covers the Vortecs as well and has lots of build up receipes and dyno results (from simple bolt-ons to semi-race). How does a 550hp/600ft-lbs 6.0 build up sound? 561ft-lbs at 2,500 rpms sounds real good to me.
Now we're talkin... Barnes and Noble is on the way home from work. I'll be late for dinner tonight.I went by Powells yesterday and they about squat for engine building.
Is this the one you are talking about?
Barnes*&*Noble.com - Books: How to Build High-Performance Chevy LS1/LS6 V-8s, by Will Handzel, Paperback
Thanks Moby.