F8L Z71

Not really. Those are dyno trick's and purpose built setups. The average head/cam 346 usually only puts out a realistic 400-440rwhp. Generally speaking they don't go higher than that in real life terms. Out of the 100s of heads/cam 346 cars in California I have yet to see more than a handful over that power rating with the stock bottom end and such. Stroker Z06s on the other hand I have seen get 490rwhp. No one that I know of has gotten a true 500rwhp out of a stock block yet.

F8L Z71

Not saying 400rwhp out of a 5.3L can't be done. Far from it. I just think it's gonna take a 2wd truck with every bolt-on concievable plus great heads/cam combo and serious tuning and maybe some dyno tricks like light weight rims/tires, lightened flywheel, etc.

2003Silvyrado

...like someone already posted. Carcraft got 458 fwhp IIRC. That should be around 400 rwhp. Youd need a wild cam, FAST intake, headers, tuning, ....I think that was it.

Flamed_Chevelle

iTrader: (3)

ktmrider, Holy cow you bored that .125 over! man that's un real, you didnt have to put in any sleeves or anything, I know it's an iron block, but man I thought going .100 over on my old big block was pushing it. You have any idea on reliability issues? I don't know how long you've had it like that? That's interesting to me, may look into that? but then again sdpc's got the 6.0L block for $700, surely I could find one on through my local salvage. anyways that's it.

Sport Side

iTrader: (6)

I believe Jarrod (J-Rod) has broken 500.
Gomer and Damian are at about 470's.
Couple vette guys w/ the new AFR 205's running 470, 490

Wait till the 225cc AFR's come out.

--I'm not encouraging dyno wars --

sfj

what intakes are you speaking of b/c all i hear is that there is very little difference between the ls1 ls6 and our truck intakes so which one are you proposing to use

ktmrider

Yeah, it was a butt-puckering event at first. I did a pre-post sonic check and the thinnest post-cut wall thickness was 0.157". I cost around $350 or so. I had bought a trashed long block 5.3L for $300 and sold the stock heads for $150.
It was kinda a novelty at the time, especially considering how many old 5.3 motors and blocks were around and cheap too. The cost of the 6.0L stuff now tho makes it sound just like it is, a novelty. You could find and build a nice 402 or 408 stroker for about the same money I spent.
But hey, like my signature says, "That block says 4.8/5.3" until it smokes the 31" BFG's from a standstill at 5000ft altitude! Wipes out my Dodge 5.7L with ease. That's why I had to go turbo on the Hemi to get the family fast vehicle award back ;-).

02sierraz71_5.3

iTrader: (2)

I interested in hearing from 5.3 owners who've built the motor without forced induction, not going over stock displacement. What was the setup and what did it put down?

Black Blown 02

In our trucks, 458 is closer to 360-370 rwhp. That last 30-40 rwhp is gonna be tough to find.

02sierraz71_5.3

iTrader: (2)

anybody know if there are any stroker kits for the 5.3