How much power can these alum 5.3 blocks handle on the nnbs?

[TvsQuez]

I have that rousch supercharger is why I haven't pulley'd down. I'd have to re-key it etc...I was looking at adding meth, but i really want the truck to be a very strong street truck. If I could push more then 8-9lbs of boost, and maybe a 75 shot? Would that be pretty dangerous to the motor? I was looking at new heads, meth, and cutouts. Just haven't really seen many with doing up their 5.3's. Most jumpt to the 6.0. Thanks for the reply.

[rutroe]

I HAD a 5.3 with a T-76 turbo @ 10 psi and 75 shot of juice. Dynoed around 480 at the wheels. My #7 let go not long after the additions (search for #7 issues on this site to see how frequent it is). I had a 6.0 installed and haven't had a problem with the power yet. The tranny (a built 65E) is another story. Looking to do the 80E swap when I get the chance.

[Frenchy]

Garrison's (LamboDoNoMoHomoRopeSucker) putting likely 550+ to an aluminum 5.3

[RUFFNECK]

I've heard 500 is the threshold for the bottom end.

[pl4yboy]

Then how did George push nearly 800 rwhp to his 4.8 for years?

[kyhunter89]

He says its because of a perfect tune

[pl4yboy]

Either way, he did it and it's a stock block 4.8... Although, it wasn't aluminum.