So I am in the market with cam swapping my Monte Carlo, during this time I am also making some other changes.

A brief rundown of my build right now is a stock 5.3, with a radix 112, 1-3/4 midlength headers, 3.0 pulley with a T56 Trans and I am currently making 430whp and 415wtq.

My intentions now are 90mm J-tube, 90mm PTM throttlebody, 60lb Deka injectors, 1-7/8 longtubes, dual QTP 3" cutouts, and a cam swap.

The two cams I am trying to decide between is the Vinci trucker or the Vinci Hi-lift trucker, here are the specs on those two cams.

The Trucker
DUR @ .004" 278*/ 286*
DUR @ .050" 216*/ 224*
LIFT .551/.551
LSA 115*

Hi-lift Trucker
DUR @ .004" 278*/ 286*
DUR @ .050" 216*/ 224*
LIFT .585 /.585
LSA 115*

Any help will be appreciated!

 

Go with the high lift.

 

High lift, but your gonna need to pulley down.

 

Why would I need to pulley down? I know as I increase the efficiency of the engine that output of boost will be decreased from the blower. But I'm trying to not spin the blower harder and hotter to the point that I need meth. Unless increasing the efficiency of the engine will cause the blower to not work as hard with the 3.0 pulley that I can jump to a 2.8 pulley and not increase IAT Temps. I'm between 35-45 degrees above ambiant temp

 

By dropping boost you will also likely drop IAT. IAT is a combo of blower rpm and boost.

 

So in that case I could go to a 2.8 pulley and have little to no impact on IAT's?

 

Correct. You should see a nice increase in efficiency and there by lower iats. To you have the original heat exchanger? Do you have the blower spacer?

 

If you are running stock ratio rockers, get the high lift.

I run the low lift with Crane 1.8 rockers. The end result is the same valve lift.

With 799 heads, 90mm J tube, 92mm throttle body, 1 7/8 ARH, and a 2.8" pulley, my combo makes 14 psi and ran 11.6 at 113. The math put my combo at around 609 rwhp. TImZ's truck (same configuration/weight as mine) ran the same ET & MPH and dyno'd a little higher than that.

How's that for some good ole fashion bench racing?

 

No blower spacer but I did price on from Rays, so I am debating. And I'm running a heat exchanger twice the size of the original and a 2.1 gallon resirvoir.

Lol bench seat racing is always fun, I'd be happy at 550whp after the mods. I'm just trying to take this Maggie and junkyard 5.3 as far as I can within reason. This build has slowly been spiraling out of control as the 112 was a impulse decision 2yrs ago, but has been the smartest move I made and still nets 26mpg on the highway.

 

My truck with a lq4 tsp 224 cam short tube headers made 479hp at 5psi through a 4l80e. That's with a mp112, iat's got pretty high though.