Id stay with the intake, once you get the rest setup for it she will make good power all around I think.

 

you might have not got a PB, but your truck come out of the hole hard, and sounds good!

 

Thanks man.. I was really hoping for 12.9's or better. I did beat a couple turbo trucks lol guess I caught them sleeping.

 

got it moving good i see
Hoping for low low 13s after i do gears and with minor head work to my 706s

 

I lost zero low-mid end going from a 317/truck intake/78mm tb to a 821/ls3 intake/90mm tb. It was a wash under 4000 rpm if I remember correctly.

This was track and dyno tested. I ran the same 60', shaved off 1/10 and ran .5mph better in the 1/8. Compared runs were at the same DA.

Imo the TBSS intake is not worth much if anything over the 317. The FAST intakes I have yet to be proven they are a performer on a 6.0L and especially a 5.3 engine. Small cams don't help on these 90mm and larger intake manifolds imo.

 

If you're running the stock truck throttle body you may want to log to see if it is sucking shut during the run. That is very common with that throttle body if you make decent power.

 

I'll talk with Charlie about this, but I'm pretty sure he would have caught this. Thanks

 

Yeah took me some milled, P&P 243's to get there,lol.

 

Wat kind of ****?

 

Ok i am sharing what i have found through my own testing. The truck intake has a reduced plenum, it can be opened up internally by removing the rear cap on the manifold and grinding out the restrictive governing hole between the front and rear chambers. Next you cut away the full length of the material forming a roof inside. This allows the port runners full acess to the whole plenum, similar to how a LS6 manifold is designed. This mod allows 5.3 to make power to 6500 as i have done and tested personally. The hand ported stock cable driven throttle body flows more than enough at around 960 cfm, the 85 mm stock truck maf descreened flows over 1000 cfm. the ducting from the TB to the maf is what hurts flow. I dont believe a larger TB is necessary at all for 400+hp