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4.8L mods?

This is a discussion on 4.8L mods? within the GM Trucks forums, part of the Vehicle Specific category; anybody done them? who makes them ? help! trying to help my soldier mod his z71...

  1. #1
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    4.8L mods?

    anybody done them? who makes them ? help! trying to help my soldier mod his z71

  2. #2
    Member 98 Stang Killer's Avatar
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    yeah K@N cold air intake, throttle body spacer, hypertech programmer, one chamber exhaust, i did that on a my 03, 4.8L ran pretty strong it would smoke the 5.3L

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    he wants to do a chip and exhaust but where the hell do i go to even look? also looking for the same on my 02 5.9L auto dodge

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    Member 98 Stang Killer's Avatar
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    u look at like summitracing.com tor jegs, or if yall got a performance shop around yall anywhere

  5. #5
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    03 chevy

    P An P Throttle Bodie.

    port and polished throttle bodie with all the goodies.Split shaft,90 degree throttle opening.Did mine big difference.

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    Senior Member SeVeReDiStOrTiOn's Avatar
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    Quote Originally Posted by 98 Stang Killer View Post
    yeah K@N cold air intake, throttle body spacer, hypertech programmer, one chamber exhaust, i did that on a my 03, 4.8L ran pretty strong it would smoke the 5.3L
    Don't listen to this guy, a very lightly modded 4.8 won't get close to a 5.3 (which is a stroked 4.8) especially once you start modding the 5.3 also. I used to own a RC stepside with the 5.3...here's some useful info.

    -A CAI is a CAI...don't pay twice as much for a brand name.

    -Don't buy a spacer for a dry intake manifold setup..it's useless and would better serve as a paper weight.

    -Hypertech is all around shiiit...if you want a great handheld buy a Diablosport Predator. For the same price you get better tunes...the ability to download custom tunes through your home computer...data monitoring and a lot more user adjustable options. You should also be able to use it for your LS1 if you have one...I put my LS1 back to the stock tune and was able to tune my old truck.

    -Get a straight-through muffler like a Magnaflow...

    -Like the other guy said...a ported TB wouldn't hurt. I had mine done by Shaner...he does great work and is a nice guy. http://s2performance.net/
    Last edited by SeVeReDiStOrTiOn; 08-01-2008 at 10:27 PM.

  7. #7
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    get you a custom mail order tune from nelson performance, pacesetter long tube headers with ORY, and a straight through muffler...forget the handheld tuners...then if you want to go a little further get a comp cams XR265 (212/218 .522/.529 114LSA) with some yellow LS6 springs...that combo right there makes some good power on a lil 4.8
    2007 RCSB 5.3L

  8. #8
    Member adam3566's Avatar
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    Or buy a $500 5.3 and add twins....

  9. #9
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    get hp tune and for a cam get the best for that 4.8 222/224 or a 220/220 you will feel it
    Last edited by SIERA*123; 08-11-2008 at 10:57 AM.

  10. #10
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    maple red metallic
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    In theory the 5.3 should beat a 4.8. But there are some cases where that doesnt happen. Ive seen some 4.8s beat 5.3s and vise versa. And yea they were stock.Some guys know it all when it comes to the numbers but ive seen the numbers get proven wrong in a few cases.

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    Member adam3566's Avatar
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    "Racing" stock trucks? How fun could that be? I would rather save my gas than be that foolish.

  12. #12
    Impounded
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    maple red metallic
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    Quote Originally Posted by adam3566 View Post
    "Racing" stock trucks? How fun could that be? I would rather save my gas than be that foolish.
    true. Point is that sometimes the numbers dont matter.

  13. #13
    Senior Member SeVeReDiStOrTiOn's Avatar
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    Quote Originally Posted by the_formula View Post
    In theory the 5.3 should beat a 4.8. But there are some cases where that doesnt happen. Ive seen some 4.8s beat 5.3s and vise versa. And yea they were stock.Some guys know it all when it comes to the numbers but ive seen the numbers get proven wrong in a few cases.
    Doubt it....they could always be hiding mods like gears and tunes.

    Quote Originally Posted by the_formula View Post
    true. Point is that sometimes the numbers dont matter.
    With all things being equal (weight[sprung and unsprung], gearing,tires, drivers) I totally disagree. We're not talking about two completely different engines/drivetrains here...which would be the case with my truck. The 5.3 has more torque through-out the power band and breathes just as good as the 4.8 up top.

    Saying "sometimes numbers don't matter" is a bunch of shit...except in the case of peak numbers. The numbers through-out the rpm range do matter (under the curve)...if you believe otherwise you'll always be staring at taillights and wondering WTF just happened.

  14. #14
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    i think he would much rather do a custom chip he does a lot of towing he has a few quads/ trailer and sometimes rents a boat..his truck will do the work he just put a gibson cat back on...i dont want to raid his pockets..but i would like him to get a lil more hp/tq and he doesnt want to go into a cam swap right now...just someting a little more sneaky so his wife wont know yet lol

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