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Old February 2nd, 2011, 03:53 PM   #1
woodchk502
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Default 4.8l more grunt

Anyone gotten more power out of the 4.8l and how?

Got a wrecked 2002 given to me with a 160000 on it and a recently rebuilt trans. Gonna shove it in my 72 jimmy and DD it. Was looking for a 5.3 but a free 4.8l is a whole lot better than a 5.3 (if ya gotta pay) anyday. So anyone do anything worth note?

Oh yeah got the whole truck ext. cab 4wd. rolled but will be parting out in the spring

jim
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Old February 2nd, 2011, 08:25 PM   #2
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r u gonna run the efi with it?
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Old February 3rd, 2011, 07:14 AM   #3
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r u gonna run the efi with it?


Yeah gonna bring the entire engine, trans, and ecm onboard. been researching the 5.3 and was gonna go that route but the 4.8 has to this point "fell into my lap" just wanted to get some more out of it.
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Old February 3rd, 2011, 07:39 AM   #4
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Yeah gonna bring the entire engine, trans, and ecm onboard. been researching the 5.3 and was gonna go that route but the 4.8 has to this point "fell into my lap" just wanted to get some more out of it.
I would say cam, headers, and a tune would help.
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Old February 3rd, 2011, 08:25 AM   #5
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I would say cam, headers, and a tune would help.
Which likely costs more than buying a 6.0 longblock and transfering all the accessories and wiring and such over from the 'free' 4.8 liter.

I think a stock LQ4 will be better than a cammed 4.8 for a heavier vehicle.

For me, I'd run it more or less stock, maybe headers and a decent intake. If your goal is more power, I'd not invest a dime into it, I'd move right to a larger longblock. Having all the accessory bits, you could probably get a longblock for $500 easy enough, which is less than an cam and tune.


Make sure your budget is honest. I'm currently swapping in a 5.3 high output motor into my 83 Scrambler. I think I have $1300 into the motor, but about $4000 into the swap. Lots of little bits in hooking up fuel, cooling, wiring, computer, etc.
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Old February 3rd, 2011, 11:26 AM   #6
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Which likely costs more than buying a 6.0 longblock and transfering all the accessories and wiring and such over from the 'free' 4.8 liter.

I think a stock LQ4 will be better than a cammed 4.8 for a heavier vehicle.

agreed

For me, I'd run it more or less stock, maybe headers and a decent intake. If
your goal is more power, I'd not invest a dime into it, I'd move right to a larger longblock. Having all the accessory bits, you could probably get a longblock for $500 easy enough, which is less than an cam and tune.

Not gonna mess with a cam but headers might be a possibility. But how much hassle will it be to get the 4.8 ecm and wiring stuff to work with a 6.0

Make sure your budget is honest. I'm currently swapping in a 5.3 high output motor into my 83 Scrambler. I think I have $1300 into the motor, but about $4000 into the swap. Lots of little bits in hooking up fuel, cooling, wiring, computer, etc.
since I have the complete truck im hoping to avoid many of the "little bits" costs. Will prolly have the harness streamlined for my install.

not sure how I screwed the quote thingy up but maybe you can sort it out when you read it :)

Last edited by woodchk502; February 3rd, 2011 at 11:31 AM. Reason: cause i dont know what im doing
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Old February 3rd, 2011, 12:08 PM   #7
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A 4.8L is a shorter stroke version of the 5.3L, the 5.3L is a smaller bore version of the 6.0L. See where I'm going with this? Buy a 6.0L in whatever form, swap all the goodies out and then sell the left overs to recoup your investment. And remember, just because it's "free" doesn't mean it is the best choice financially.
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Old February 3rd, 2011, 12:44 PM   #8
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since I have the complete truck im hoping to avoid many of the "little bits" costs. Will prolly have the harness streamlined for my install.

not sure how I screwed the quote thingy up but maybe you can sort it out when you read it :)
Understood. Just warning to be realistic. The things that I mentioned add up.

You need to look at the cooling system. Maybe the one from the donor can fit your blazer, maybe not.

The fuel fittings are quick connects, and need special fittings to work with.

You'll likely need to reflash the computer and rework the harness.

Transmission? Torque converter?

Not trying to discourage at all, they are great motors.

I'm putting in a 5.3 with a TH350 into my scrambler. Things I 've had to spend money on:

The motor (duh), included the pedal, TAC module, fuel pump, accessories.. ($1300)
ECU reflash ($200)
Harness rework($350)
torque converter (to better work with the rpm band for the 5.3) ($225)
crank spacer to work with the TH350 ($40)
headers ($450)
gauge senders/adapters ($50)
radiator (pass side in and out) ($225)
Engine mounts ($150)

things still left to get

lines for steam ports
surge tank
radiator hoses with adapters to fit the LS size inlet/outlets
fuel lines & adapter fittings
new serp belt
oil pan & filter
intake & filter parts


In my case, I have more beyond that since I'm swapping in a TH350 as well...
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Old February 3rd, 2011, 04:29 PM   #9
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A 4.8L is a shorter stroke version of the 5.3L, the 5.3L is a smaller bore version of the 6.0L. See where I'm going with this? Buy a 6.0L in whatever form, swap all the goodies out and then sell the left overs to recoup your investment. And remember, just because it's "free" doesn't mean it is the best choice financially.
doesnt really sound cheap,,,,,,,, financially.
care to elaborate on this a little more?
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Old February 3rd, 2011, 08:18 PM   #10
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one thing you should decide before you start is what is your long term goal with this. do you want it just be a nice turn guy motor that you can play with. or are you going for big power. maybe just put it in the way it is, then get yourself some tuning module or software and do stuff a little at a time depending on how much you want to and can dump into it at a time. start with some headers and maybe a decent intake. then swap cams, then maybe some head work sometime. just take a little at a time to help spread out the cost. i mean you already saved some money by gettin this vehicle givin to you.
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Old February 4th, 2011, 03:22 PM   #11
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Originally Posted by mprmn08 View Post
one thing you should decide before you start is what is your long term goal with this. do you want it just be a nice turn guy motor that you can play with. or are you going for big power. maybe just put it in the way it is, then get yourself some tuning module or software and do stuff a little at a time depending on how much you want to and can dump into it at a time. start with some headers and maybe a decent intake. then swap cams, then maybe some head work sometime. just take a little at a time to help spread out the cost. i mean you already saved some money by gettin this vehicle givin to you.


Well in the end I want it to be my DD and toy so I can park my P/U for awhile. As for sticking money into it Im not sure was kinda wondering if its worth it in the end. I liked the 2002 5.3 that I used to have the 4.8 always seemed a bit lacking in comparison. But if I could get it on par with the 5.3 without getting to deep into it as well as not killing the mileage then it would be the way to go. will definately be putting it in how it is and will go from there, I was just looking for ideas on upping the output a little.
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