upper intake manifold bolts.

[dirtydrywaller]

hello
96 gmc yukon slt, 5.7 gas
can anyone tell me the size of the bolts that secure the plastic upper intake manifold that goes over the spider injectors.

i changed out the spider injector, did the upgrade and a few of the bolts are stripped out,wont tighten fully and i have a massive vac leak which i believe is causing a misfire,
id like to fix them with helicoils or similar but cant find anywhere that says what the bolts are, cant even find replacements.

thanks for any replies.

 

[B-train]

Can you match one up on a thread guage?

 

[dirtydrywaller]

Can you match one up on a thread guage?

i took one to ace hardware and tried that but these bolts have a blunt button type end on them and it doesnt really thread into the guage they have very well.
they are stud type bolts that are used for mounting brackets for other parts on the engine.
i cant believe i cant find them anywhere on the net.

 

[B-train]

In those years, GM wasn't sure how they wanted to identify....standard or metric. They were a mix of both on lots of things. I did some digging and this should be what you need I believe. I also think they are standard thread from what I've read.

 

[exp500]

Is this what you seek?

 

[dirtydrywaller]

Is this what you seek?
View attachment 410873

thank you very much, those are the exact bolts and i just ordered some along with the correct helicoils. thanks thanks thanks !

 

[dirtydrywaller]

In those years, GM wasn't sure how they wanted to identify....standard or metric. They were a mix of both on lots of things. I did some digging and this should be what you need I believe. I also think they are standard thread from what I've read. View attachment 410868

thanks for the help !

 

[Foot0069]

If you're going to use helicopter coils it really doesn't matter since you're drilling them out to start. Just use a comparable od bolt.

 

[Foot0069]

If you're going to use helicopter coils it really doesn't matter since you're drilling them out to start. Just use a comparable od bolt.

Oops, spoke to soon. Need the double headed gizmo bolts. See I don't know what I'm talking about.