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Foose04 · 06-17-2010, 04:50 PM

I been giving this some thought, looking for opinions. Can the old little 4.8 handle a few pulls to clinch the 600HP mark for nothing more then shits and giggles & maybe a few track runs later on.

Current setup made: 528Hp/528Tq

600hp Plan: remove the Kenny bell boost a pump, install another walbro 255, install stronger wastegate spring, turn timing down to around 15, and turn boost up till 600hp is reached.

Thoughts and or opinions?

Some guys pointed out the ls6 valve springs being weak. How can I tell on the dyno when there not staying shut? Also, still have stock head studs, gaskets, and rod bolts. Any one push these to failure, assuming tune was correct?

Other fun stuff, the true-track and 305 DR's hook awesome, even first gear. However, truck isn't track capable AT ALL with this 5speed nv3500. It refuses to shift into 3rd after a hard 2nd gear pull. This trans only has 25k miles on it, running GM fluids. After the HP is made, some kind of transmission swap will be done, either stick or auto.

06-17-2010, 04:50 PM	#92
Foose04 Senior Member Join Date: Feb 2010 Posts: 965	I been giving this some thought, looking for opinions. Can the old little 4.8 handle a few pulls to clinch the 600HP mark for nothing more then shits and giggles & maybe a few track runs later on. Current setup made: 528Hp/528Tq 600hp Plan: remove the Kenny bell boost a pump, install another walbro 255, install stronger wastegate spring, turn timing down to around 15, and turn boost up till 600hp is reached. Thoughts and or opinions? Some guys pointed out the ls6 valve springs being weak. How can I tell on the dyno when there not staying shut? Also, still have stock head studs, gaskets, and rod bolts. Any one push these to failure, assuming tune was correct? Other fun stuff, the true-track and 305 DR's hook awesome, even first gear. However, truck isn't track capable AT ALL with this 5speed nv3500. It refuses to shift into 3rd after a hard 2nd gear pull. This trans only has 25k miles on it, running GM fluids. After the HP is made, some kind of transmission swap will be done, either stick or auto. Last edited by Foose04; 06-17-2010 at 04:55 PM.