4.8 stock bottom end 600hp
08-05-2017, 10:48 PM
#1
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4.8 stock bottom end 600hp I have a 4.8 in a 04 sierra reg cab short bed. I took the motor apart last summer and cleaned up everything. While it was tore down I threw some 243 heads with some blue springs on it. Also put a boost cam with mid to high range power. I'm already in the works of getting a turbo, injectors,and fuel pump upgrade. I'm just wandering what kind of power this setup will yield and what else I would need to make around 600hp if what I have isn't enough. Thanks in advance open to anything I'm still learning myself
08-06-2017, 12:10 PM
#3
I'd recommend more spring than that on that small motor. I have Comp 918s on my 317s with an LS6 cam in my Gen 3 4.8 (spun a bearing), and ran up to 17psi on 91 octane alone because of the low compression. It was probably only making 500rwhp, but a gen IV with pump/meth could easily break 600rwhp in the 20psi range if properly tuned, but I'd recommend more spring pressure, because these little 4.8s like to rev (mine loved 7200).
08-06-2017, 12:37 PM
#5
On my previous Gen IV 4.8, I was making 760 on 16psi from a 78/76, granted that was through a M6, but with the right setup you can absolutely make good power. I've since gone to a Gen III (old one spun a bearing) and a TH400 so I'm sure i'm making a good bit less, but don't discredit the potential of the little 4.8, just have to make sure your setup is moving air!
08-06-2017, 05:08 PM
#7
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