im running 13 psi on my 5.3, daily driver. no problems. dont see any reason why you couldnt turn it up to 16-17 for a reliable setup. granted i have studs, head gaskets, lifters, springs

 

i'm running minimum 16lbs on mine thats completely stock other than ls9 gasket's, studs, and pac 1218 springs. i usually am at 18 lbs (reasons why i want a better boost controller) but i have been up to 24ish pounds a few times on a spike and usually around 22lbs more than plenty occasions. and this is a 4.8 that i will do pull after pull on. I have all the faith's in the world in this motor. (good thing i parked it for a while now so i cant go blow it up)

besides the point your motor can take it as is, but to be safe you are good not going over 15.
And what was your exhaust before and what is it now to make that much of a difference?

 

I bet those "stock" 4.8s didn't have 100% stock valve trains. Especially not DOD BS. Stock bottomend sure top end not so much.

 

Those 4.8L engines have lower CR than 5.3 and can take a lot of boost provided you have good fuel and good tune.

 

You guys have the top end goodies. I do not which is why I don't want 15 psi

 

Sure can, it was just a question for referance.

Stock valve springs are weak enough, once boost is added in they have a even harder time.

 

Jacks, you don't want that turbo anymore. Too much headache. You should just take it off and sell it to someone you know one town over, cheap. *cough *cough

 

Be careful what u ask for. Next year I might be posting it for sale and start a new project.

 

Boost has very little to do in deciding if your engine blows up or not

 

you would need a bigger turbo for your 6.2, it would be perfect for my application lol


i bet that 15psi is fun though. ill have to come to the track one of these days if i get a weekend or a day off to see some of the western NY fast trucks.