Pretty sure all 2010 4.8s have vvt, did they convert from the VVT to non VVT when they did the hot cam? I have a pretty similar setup in my 4.8 and my truck acts the same exact way. NOTHING down low then when it starts rolling the power comes on. I starting to think the 219/228 split is not a good duration for that engine, its possible if they kept the vvt they installed the wrong core also. I am actually in the process of swapping to a smaller duration cam. Below are some desktop dyno numbers. I know its not gospel but it gives a good idea of how the engine will react. BTW I only have the older version so had to use a gen1 block and change the bore/stroke, valve sizes, and may even be wrong on the intake cfm but use it for a general idea.
This one is 4.8 with a Hot cam and according to my Butt dyno I would almost confirm these numbers are pretty close.
current cam by Badger009er, on Flickr
This the exact same setup but with the valve events from my new cams card and you can see a dramatic increase. I will have it in by tomorrow and shipping the pcm to NP for a reflash.. I let you know how the butt dyno feels after.
purchased cam by Badger009er, on Flickr
Last edited by Gus; 08-03-2012 at 02:54 PM.
2010 Silverado 4.8 Ext Cab 4x4
Cam, Stall, 4.88's
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Originally Posted by Gus
