How many lbs of boost should I see with a LS6 cammed 5.3 under a M122. 2.6 drive ratio (3.0 SC pulley, 7.8 crank)

10 rib belt drive so slipping isnt an issue

Would a 2.6/2.8 pulley be excessive?

 

Longtubes? What other mods does the truck have?

 

I had an MP122 on a 6.0L with LS6 cam and bolt ons. With 2.8" pulley, I saw about 9psi. I don't think that blower, with 2.8" pulley, on a 5.3L would be excessive at all. Actually sounds like a lot of fun. Might be a little tough on drive train components though.....

 

Not in a truck, this site has significantly more roots LSx engines so the knowledge is here

1.75-1.825 step headers, dual 3" exhaust
Swapping the 4L60E for a 4L80E
Boost referenced return fuel system, aeromotive 340, 60's

Itll be a definite step up above what Ive got now for sure

 

I make 12 psi with a 3.0 pulley on my MP112. I say put it on, start with the 3.0 pulley you already have, then pulley down if you want more.