2004 Chevy Monte Carlo SS
2004 Chevy Monte Carlo SS
L67 Throttle Body
JB Welding
As I mentioned earlier, to make the L67 properly mount to the mating surface of the L36 upper intake manifold, would require some work.
I grabbed a used L36 throttle body gasket from a junk yard to use as a template for the shape of the exit flare.
As seen in the first picture, there are spaces that will need filled. I was in debate of a couple of products for th task
(various types of epoxies, metal fillers and JB Weld). Around this point, I found 95NASTA on a Bonneville forum who already
did exactly what I was beginning. I hit him with a couple of questions and found, he used JB Weld and it has not given him
any problems.
BEFORE filling with JB Weld, make sure your surface is as clean as you can make it of chemicals, carbon, and other substances that
may cause a problem with the JB Weld properly adhering to the throttle body.
I found the base of an empty pop can works great for mixing two part products like JB Weld. I also found using popsicle sticks
(found in a large package at my local dollar store) works fairly well for mixing and applying JB Weld. I believe it took me about
two packages of JB Weld to fill all the space I needed to fill. When I was done, the JB Weld was a tab higher then the surface of the
throttle body, this ensures I did not have too little (making hollow spots).
The pictures below are after I had used a fine grit, mini-sanding disc on my power drill to level and smooth the work surface.
In the first pic, I drew an arrow to a small pass under the throttle body outlet. This passage is used for coolant to enter
into and help "warm" the incoming air as it comes into the throttle body. I decided, I did not want the incoming air to be
warmed, so I filled it in. My idea behind that is that many people install Cold Air Intake systems and warming the incoming
air seems somewhat defeating of the "cold air" part of those systems. At this time, I am not planning on a Cold Air Intake
for my Monte Carlo.
The other items I have an arrow pointing to is a small tubular passage behind where the throttle position sensor is mounted. Some
of the vehicles that use this throttle body require an extra vaccuum line from that opening, in my case I do not. The reason I
point this out is that I found while I was forming the exit port, I eventually had to fill that passage with JB Weld (as I grinded the exit flare
, it opened that up passage up). If I had it to do over again, I would have filled that passage before I began forming the exit
flare (as doing it after I opened it from the inside just made it annoying to fill in after the fact).
L67 Throttle Body Project Description
Donor Throttle Body
MAF Bridge
-->JB Welding
Exit Flare
Polished Inside
Painting
Final Product
