ls1ow

iTrader: (1)

just traded in my 99 TA and got a 03 sinlge cab step side silverado, and damn do i love it, but the moding bug has already got me and the call for a built 6.0 is getting stronger and stronger, so my question is what do stock 4.8s usually put down for power, and then what do they make modded a lil im looking at doing longtubes and some true duals, and then a LS6 cam and some new 918s on it. also a full tune with HP tunners from fastech, so what kinda of power would i see before and after

thanks for the help,

John.

ls1ow

iTrader: (1)

so any know??

vanillagorilla

iTrader: (1)

You can expect about 300rwhp N/A with bolt-ons and a cam. 500rwhp can be had with about 18psi.

shandy294

Stock 4.8 is 285hp...in 99,it was 255...270 in '00..and 285 in 02 or 03.

The LTs are good for 15-20 hp
That cam...I don't know
A good custom tune can knock 4 or 5 tenths off stock ET
E-fans...5-8 hp
Pullies...?
CAI...maybe 10 hp

therock

iTrader: (2)

...to the wheels.

zippy

i would guess stock to be around 220 and with those mods around 285 or so. you're going to want a stall though. with the stock cam it needs one. with any bigger cam than stock it's almost a requirement. the 4.8L down low is embarrasing.

ls1ow

iTrader: (1)

so what do they dyno to the wheels bone stock?

shandy294

Zippy said 220...seems like I've heard that number pretty often. It's roughly 18% less at the wheels than flywheel. Using that: 285 x 0.82 = 233.7 ... 220ish to 230 or so,I guess.

ls1ow

iTrader: (1)

not bad im just looking to gain some mild performace and still run like it does stock, and pull my jet ski and soon another f-body

8ALTNG

iTrader: (1)

More like 509rwhp at 18psi but how is counting