INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

Hp #'s and mods w/4.8

Old Nov 3, 2007 | 05:04 PM
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Default Hp #'s and mods w/4.8

I was wondering what some of you are laying down w/your 4.8. And what mods put you there. i'm looking to lay a baseline for mods. I'm looking for a range in the 350ish to the wheels.
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Old Nov 3, 2007 | 05:20 PM
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i hate to tell ya but i done think there is anyways to get 350rwhp with a 4.8 naturally aspirated, you could get there if you had either nitrous or at least 6psi of boost
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Old Nov 3, 2007 | 05:39 PM
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i could wish right, lol. Either or i have a 4.8 and would like ideas of what some a putting down, i will go to a 6.0 eventually but right now i'm just looking @ my options and all bolt-ons for the 4.8 are able to bolt up to the 6.0
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Old Nov 3, 2007 | 06:53 PM
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you could "bolt on" a radix and that will get you there
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Old Nov 3, 2007 | 07:31 PM
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i ran 5lbs w/ everything else stock, and put down 397 and 406.

Last edited by SpoolinChevy; Nov 3, 2007 at 07:54 PM.
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Old Nov 3, 2007 | 10:56 PM
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yeah i hear ya... but i don't have 4-6k laying around, but i do have a nice low miles 4.8 laying around
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Old Nov 3, 2007 | 11:11 PM
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The only mods i had when this dyno was done were 243 heads, cam, CAI and HPE tune. And it put down 312HP and ran a 14.6 1/4...I since have added LT's, 3600 stall, 4:10's no cats and a Nelson tune and running a 13.5 1/4.....so what its putting down now is a good guess, but i bet it would be close to 340

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Old Nov 3, 2007 | 11:35 PM
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Originally Posted by Gator
The only mods i had when this dyno was done were 243 heads, cam, CAI and HPE tune. And it put down 312HP and ran a 14.6 1/4...I since have added LT's, 3600 stall, 4:10's no cats and a Nelson tune and running a 13.5 1/4.....so what its putting down now is a good guess, but i bet it would be close to 340

Thanks thats some good info. i appreciate it. How's that cam run in the 4.8? b/c everyone says that over a 218 it gets rough.

Anyone else?
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Old Nov 3, 2007 | 11:47 PM
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It takes that Cam very well with no major problems to speak of...Idle is great drivability perfect...the only thing is that its a little blah out of the hole i could have gone with a little more stall
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Old Nov 4, 2007 | 12:23 AM
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yeah thats what would probably kill me. I have a 5-speed as of right know but again mods later down the road include 6.0 and 6spd which my bro has done and I love his truck but I'm paying on a 00 T/A right now aswell so mods are going to be slow on the truck
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