Has anyone had problem running these springs in boosted applications?

 

Depends on what lobe(s) the cam has. "softer" lobes are more rounded and aren't so aggressive. The valve is off its seat longer (you can tell by looking at the total duration) and these camshafts usually are gentler on valvetrains. Now step into the world of COMP XER lobes (such as what tex speed offers) These lobes are the most aggessive hyd roller lobes that comp offers today, they provide more power under the curve, smoother idling, better power curves but at a cost. The cost is you need to run a more stable valvetrain, live with the valvetrain noise and expect 50K miles or so out of the springs before they're shot. If you're referencing the vinci cam with the specs above, I wouldn't be afraid to run the yellow springs.

 

Yes it is the Vinci Trucker Cam.Thanks for the info.

 

gm book says they are good to 570 lift

 

the duration doesn't really matter, its the ramp rate that causes the floating that he was talking about. Contact Vinci, and ask them if the ramp rate is TOO STEEP for the LS6 yellows. They should know...