M60gov20

iTrader: (1)

My truck is a 2500hd on 35's with a 6.0l and 4l80. When I first installed my 4.88's they were a huge improvement over the 4.10's. Since then I've added a converter, cam and tvs1900. Low end power is pretty strong but it feels lacking on the top end. It almost feels like it would run better with the 4.10's in it. I'm going to be going to a 92mm Holley throttle body tonight, maybe that will help. I'm just wondering if anyone has done the supercharger first and then gears?

03sierraslt

iTrader: (22)

What size cam?

M60gov20

iTrader: (1)

It's 218/232 112.5+3.5 .578/.578. Cam Motion

Vortec350ss

iTrader: (20)

Is it an RPM you feel it dropping off?

Thats a cam thats definitely going to shine in the mid range. But it should make power to 6000 RPM just fine.

M60gov20

iTrader: (1)

It just pulls a lot harder up till 4800 rpm or so then flattens out quite a bit. Still pulls but not nearly as hard. Maybe the t-body will help it out up top.

trxmxzx

iTrader: (7)

Vortec350ss

iTrader: (20)

Are you still running the 78mm?

M60gov20

iTrader: (1)

Yes, my new 92 came in last night. Putting it on tonight.