LS9 cam in a 4.8, what to expect?
#12
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Just my 2cts, but I would advise against the LS9 cam here strongly. That cam is designed from GM to have a positive displacement blower behind it. Look at the size of the split between intake and exhaust, and LSA. Its designed to lower cylinder pressure because it has the blower forcing the air in throughout the rpm band. Skoalbandit just put one in his N/A 5.3, and trust me, its a dog under 5k rpm, and then not really that impressive above that.
#16
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If you've already got a LS9 cam for this, I'll trade you strait up for my LS2 cam. its a 3-bolt, angle sensor on the front cover.
The ONLY reason you'd want an LS9 cam in a 4.8 is to boost it.
The ONLY reason you'd want an LS9 cam in a 4.8 is to boost it.
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Couple thoughts....
When Jake99 says that you want Less dur more lift, that's a more aggressive ramp rate lobe. That's tolerable to the point of frequency you want to be changing valve springs, and how much money you want to spend on valve springs. But he is absolutely right, as more lift area under the curve equals more potential air flow, which will generate more power/torque. LSA is a "Number" that is a by product of where the lobes are set relative to each other, and it is not necessarily viable to say a tight LSA is advisable over a wider LSA. It's all dependent upon what lobes he uses, what the RPM range of maximum torque production is intended to be, and how it is aspirated.
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