Will be doing my truck at some point, having a custom plate made as there is not enough meat in the bottom for the groove with the Throttle plate in idle position.

This TB is somewhat unique, they have designed the venturi to accomodate the air flow, I created a drawing to show what they have done. (Such that it is)



Let me know what y'all think

Karl Fortner
TAcoma, Wa.
GadgetmanTacoma
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Hi Karl,

Yes, it is true that the grooveable spot on this TB is restricted/narrow. We have one here in the shop today for engine work and I looked at the TB on the bench. You have less than 1/8" between the base of the plate and the mounting surface. I see why a custom adapter may be needed to increase the grooveable area. I don't know at this point how many applications this TB is used on.

Let us know how you fair with this!

If you guys will check out pecostwister.com/Gadgetman_Groove.html you will find that Rick McKean, who runs the HHO Rally once a year shows an Avalanche won last years run.

The interesting thing about this is with HHHN, the vehicle went from 17 to 26. After receiving The Groove it registered a WHOPPING 47.6 mpg's to take the win! (Rick mentions 30, but the figure I got following this video is the 47 number)



While it APPEARS to be too narrow, it is not. The Groove WILL go in using the largest bit, but the leading edge (closest to the engine) will go slightly below the old surface. Still, it's enough to see tremendous gains, IF you do the rest!

So, as in all cases, remember the three rules:
Do the mods
Do the MODS
DO THE MODS!

The 5.3 and the 6.0 all use the same throttle body. There is room to cut the groove, and you dont need to do anything else excet pcv. I use the full size bit and it should take about 30 to 40 min max to cut groove and re install the throttle body. The pcv vaccum is straight back from the throttle body on top intake. I use a tee to hook the hoses to the passive in front of throttle body,where it has a 90 degree bend. After you do this you`ll want to do all 5.3 and 6.0 engines!!! There is coolant lines on the bottom of throttle body. I always check the tps, which is the throttle position sensor, degree before I cut groove to get exact location. Dan gadgetman Mo.

I've already had this TB off the engine several times, that is how I know what it looks like.

This looks nothing like the TB that Ron had off the 2007 Escalade that he did the video on.

Also, only connections on this TB is the TPS and the air intake plenum.

The Venturi on this TB is contoured with the expectation of the air flow to primarily go to the low side of the throttle plate, the upper side of the Venturi is also shaped in a way to maximize the air flow to the bottom.

that raised area in the bottom view is about 3/8" in from the overall diameter of the base I.D.

I'll get a couple more pic's and post them.














If the weather is good tomorrow, I will pull the TB off and get some pic's of the inside.
Karl Fortner
Tacoma, Wa.
Gadgetman Tacoma

First off... Thank you Dan for making me think!!

So, today the sun is shining, temperature 48F, light breeze in Tacoma, Wa.

That means today the TB came off the engine and we took pictures.

What I found was an education for myself, which I will share.

The detent position of the throttle plate, when the engine is off, is not the closed position. Because the TB is computer controlled, the detent position is actually at 31 degree, which allows them to move the plate in either direction and not hit an end stop.

The full closed position shows about .500 inches of metal below the throttle plate, the idle position 17-19 degree's is in that lighter colored area closer to the closed position. Then there is the darker band which is where the groove is going to go.

You'll also notice the contouring of the venturi, my recollection on the dimensions were obviously off (pictures never forget) so there is plenty of meat to put the groove with the large bit, there may be a couple of spots that it may come through... they will be filled in before any cutting occurs

Now the pic's






Off/detent position




Closed position




Idle position 17-19 degrees




Intake manifold




and that is my 2007 Chevrolet Avalanche 5.3L Vortec TB, and now I am also more educated than before

Karl Fortner
Tacoma, Wa.
Gadgetman Tacoma