HI guys new to this forum and just picked up a 1999 4.8 out of a 2×4 silverado. Guy said engine has 14x,000 on it and ran before he pulled it, (truck frame was bad). My game plan is to take the rods and pistons out and make it a 5.3. I'm not a big motor head and know everything but I am a Diesel Mechanic. Need advice for what works best for putting in different LS parts. Wanting to go all forged rotating assembly and more than likely a FAST 92mm intake or what someone this is better or same for less money. I don't wanna spend out the butt on for this build but want to make big power. Debating a turbo system something in 60mm range. Just need some advice from people with experience. Putting motor in 85' s10.just going to be a street truck and drag it once in while. Also live in the great retard state of NY so want to eliminate as must ecm and emissions crap since they only require them from 95 and up. Thanks in advance.
Craig.

 

Honestly just leave it alone.

The stock bottem end will live with 500-600whp without caring, you don't need forged parts for that.

And the FAST intake would be a waste on money for your needs/wants.


Basically just use that motor then buy the turbo stuff, injectors, map sensor, fuel pump/regulator and then all the nickel and dime stuff and you'll have a 450-600whp build without having to buy anything fancy.

If you still want to open the motor up and clean it up, open up the ring gap on the piston rings and slap it back together.

 

Even with it having 140k on her she will still hold 500 or 600 hp? I will still check it all out but always thought those numbers on a newer ligtly used motor.I'm going to delete the ac, and do electronic fan instead of using stock setup and try to get back some lost hp.

 

Mileage really means nothing if it's still running good.

Tons of guys buy high mileage junk yard units with 180-200K+ and just slap them in a vehicle and make 500+ hp without a worry.

 

Av,

It'll hold up. My truck has 179k, I'm pushing low to mid 500hp out of the turbo'd 4.8l. I'm currently installing a meth kit and hoping to push 600+hp on 14-15psi of boost. Its probably only been boosted for 5000 miles or so but I beat the crap out of it. Its been to the track for the last 20,000 miles and I've spun it to 7000+rpm with only valve springs and pushrods.

To get big power (seems you're thinking 5-600) out of a 4.8l you'll need forced induction or nitrous (probably 200+ shot), however even you were to build a 5.3l you wouldn't be too far ahead of the 4.8l you started with.

Just my .02.

 

Yeah my first engine build and I went 50/50 with my brother for motor and 4l60e trans. Paid 375 for both. Just a learning experience and little bonding time. What turbo set up are you running? Prolly nothing over 60mm right? Also what route do I take for a "stand alone" ecu style like what stock cars and such use? I wanna eliminate as much electronic as I possible can like evap and crap like that. Kind of like the older engines pre 95 with computer style. Not really sure if it's possible with thsee GEN motors or not.

 

I'm running a 76/68 turbo magnum. Not the highest quality but not the cheapest either. I like it.

For the ECU theres a bunch of different ways to work it. You could make a stand alone computer by getting the wiring harness and ecu out of a donor truck or LS car, read the pinouts, and only keep the wires you need. There are also different stand alone ECU's you can buy such as Micro/MegaSquirt. I removed all of the emissions wiring and sensors off of my truck.

 

Sensors you don't mean the crank and cam sensors to correct?

 

He's talking like evap, egr, a/c, rear o2 sensors type of things.

I'd just get a factory wire harness with a stock truck computer and tune it with that setup. You can disable all the check engine lights in the tune from all the missing sensors and most of the 2000-2002 cable throttle body computers can support a 2-3 bar operating system upgrade for going turbo.