So as it seems 4.8's are fairly easy to find as pullouts and also, slightly cheaper than dirt (everyone wants a 5.3 or 6.0 something tells me.) so I've been thinking: Why not?

Honestly though I don't know enough to know if just any 4.8 will do, or if I have to find one made at a certain time.

Basically I have a desire for 450hp at the crank from this little critter via a turbo and hopefully a nice little switch to turn it up a few notches for that "I'm not losing dang it!" run.

Any suggestions? I am a newb with anything but older small blocks (you know, back when carbs were in vogue.) So please try not to hate me too much.

 

Correct me if i'm wrong but I believe kbracing is in the 450 hp range.. with his 4.8L at 12psi.

 

I have a fully built 4.8L. Forged and built through and through. tell me what you think. its for sale.

 

just do a 5.3L. There is a pretty big difference between the 4.8 and 5.3L, but honeslty people aren't running THAT much better times between the 5.3L and 6.0.

You can snag a complete 5.3L with a wiring harness for under $900 and you'd need simple stuff like motor mounts and you can be up and running for around $1500

 

I can get the 4.8l's for really cheap, and I'm not really scared of killing it (except for having to take it out and put another in, engine swaps = pain in butt.)

I'm dithering on whether to go auto or manual. And trying to figure what it won't break. I know I'm going to do my axle, but what transmissions? I am definitely going to use this power so I want something that will take it.

So am I right in thinking that a 4.8 is a 4.8? No big changes that should affect how it will handle boost? 12 psi sounds about like my target, maybe a bit more. If I hit the same specific output as my buddy with the 5.3 I'll have at least 600 through. Granted my setup will probably be more tame than his and honestly I don't know if I could afford all the supporting bits to handle that power right away.

 

im running a stock tranny with vette servo's and transgo hd-2 shiftkit with a 2500-2800 stall converter, it has been holding up fine. I see about 190 to 200 degree tranny temps, in city, stop and go traffic.. without a tranny cooler. I will be putting one on this weekend. What is a good temp to be aiming for for the tranny? I'm only running 6psi though. When the methanol kit shows up then i'll be bumping the boost.

 

get an flt trans if you plan on #'s that high.