In other words i am on a tight budget and need help on this

I have a stock 4.8L with flowmasters from the headers back and a k&N intake.i want 400 hp without anymore boltons besides i am going to get headers soon.i dont have enough money to buy performance heads or anything like that.what LS6 parts should i buy from him?what else should i do as far as rods and pistons?where can i get them for my truck?NEED HELP

 

To thunder.i would like to make a built 5.7 with 400 hp.can u help?remember im on a budget

 

First off, you need to make sure you keep in mind that heads and cam are probably going to be the two most important components in making your power goals with a N/A motor.

The LS6 cam is a good cam for boost. If you are planning on staying N/A I think it might be a little on the small side for a 5.7L, but that might be ok depending on what you want. If you get an 01 or later cam I think the specs are something like 204/218 on a 117 or so LSA. It would probably be a good low-end cam but will run out of steam up top probably a little before 6000 RPM. On the other hand, it's not far off from the Vinci Ultra-torque cam, which I had a loved in my s/c 5.3. That's a 210/218 on a 116 LSA. Keep in mind though, you'll need to go with a fairly good sized cam to make the kind of numbers you're looking for. I doubt the LS6 cam would support 400 rwhp in a N/A setup, but I could be wrong.

Heads - you're going to need to do something to your heads to make your goal N/A. I can almost guarantee you that bone-stock heads would not support 400 rwhp.

The crank would be a good place to start, as long as you're limiting your power goals to under about 550 rwhp. That's about the limit of where I would feel comfortable taking a stock crank. If you did the crank only and kept the stock bore size (I think you would need to change rods too, but I'm not 100% sure) it would turn your 4.8 into a 5.3.

The rocker arms would be a wast of $$, you have the exact same ones in your 4.8 that come out of the LS6.

Springs would be good, as long as they are low mileage. The yellow LS6 springs are good to about .57" lift. As long as the cam you run is under that and you're not running super high RPM's those should be sufficient. If they are getting up there in mileage, remember that a new set of LS6 springs can be have for about $60. Those are cheap.

You should probably expect to spend somewhere in the range of $1000-1200 for GOOD machine work to bore, hone, line hone, deck, and clean up your block and have it assembled.

LS1/LS6 forged pistons and rods should be super easy to find in stock bore sizes. I'd say expect to spend somewhere between $400-500 for a set. Diamond, JE, Mahle, Wiseco, and Probe are some good names just off the top of my head.

Rods - depends on what you get. Companies like Eagle make decent stuff, but it's on the low end of the forged components. As I said before, if you're limiting your power goals to 550 rwhp or lower I'm sure you could get away with the cheaper forged rods.

I'm not sure if the LS6 cam gear and timing chain are any better than the ones in your 4.8. I know that the LS2 crap is supposed to be better. You'd have to look at it and see what it looks like. If it's the same as what's in your motor it would be a waste of $$.

You're also going to need to include a new ring set and all new bearings in your price, as well as a new set of seals. I would expect to spend somewhere between $400-600 for all of that depending on what you get.

You need to get some pricing together and see what you'd be looking at. These motor builds are never cheap....remember you gotta pay to play. In all honesty, you may be better off looking for a 6.0L and sticking a cam in it like nightrunner said above. There's a lot of little expenses that are very easy to overlook.

 

Thnx for the help bro

 

You want my forged 4.8 liter?? 900.00 plus shipping. 1100.00 plus shipping with the ported LS1 Heads.

 

how much hp is it making?how many miles?and is it a complete motor no problems?

 

Thunder..

I have a 5.3l .....would an upgrade to 241 ls1 heads give me an increase in horsepower?

i was afraid of piston/valve clearance issues or compression issues what do you think?

thanks for the input.

 

I'm not real familiar with specific flow numbers of the different heads. I also don't know the chamber sizes off-hand either....wish I could help you more. I'm sure there's some threads out there that deal with this though, try doing a search.

 

buy the motor for 900.and your finished

 

2 bad he had all that work done and its only makin 310hp.he emailed me back