LS truck accessory fitment in a G-body

[BuickBroke$]

they're not supposed to.
from holley,

https://documents.holley.com/g_body_ls_swap_tech_data.pdf

The stock truck A/C compressor can be installed with these mounting brackets by notching the vehicle frame crossmember and the aluminum compressor mounting bracket that is attached to the engine; the 4th-gen F- body/GTO A/C compressors are not compatible for installation with these engine mounting brackets. Use of Holley 20-140(R4) or 20-134 (Sanden) compressor brackets are recommended for providing simplified top- mount A/C compressor installations in this LS swap application.

I would love to see pics of the modified compressor bracket!!!

 

[FastCraig]

they're not supposed to.
from holley,

https://documents.holley.com/g_body_ls_swap_tech_data.pdf

The stock truck A/C compressor can be installed with these mounting brackets by notching the vehicle frame crossmember and the aluminum compressor mounting bracket that is attached to the engine; the 4th-gen F- body/GTO A/C compressors are not compatible for installation with these engine mounting brackets. Use of Holley 20-140(R4) or 20-134 (Sanden) compressor brackets are recommended for providing simplified top- mount A/C compressor installations in this LS swap application.

Well crap. I did read the instructions but apparently didn't comprehend what I was reading. Would this Dirty Dingo accessory bracket kit fix my problem?

SK Speed Part Number: DDMDD-LS-ALT-PS-AC-SANDEN

This is a package deal on both sides of the Truck accessory engine. This kit includes our billet alternator/power steering bracket for truck accessories and Sanden 508 (9537) compressor bracket.

 

[FastCraig]

FastCraig, take a close look at the illustration on your instructions, looks like you might have the same problem I had. The radius around the bolt holes need to match the picture exactly or you have the C10 mounts. I had this issue and thought I was crazy but they claimed that they have had misboxing issues in the past and that’s what happened. They sent me out the correct ones.
If you look at the attached picture you can see these are the wrong mounts.

Now, they still won’t clear the stock truck compressor unfortunately, even if you notch the frame, it just won’t clear the compressor bracket.
Also, Anubis, you’re incorrect when you say that the mounts work if you put them in the Holley location. I think a lot depends on the build variables, but in the Holley recommended location it won’t clear the heat/ac box. I moved mine to the forward most holes to get it to clear, then swapped the

I knew I read that somewhere. I searched for this thread but it didn't come up. I was sure I had got the wrong ones also. I'm going to call to verify.

 

[BuickBroke$]

I knew I read that somewhere. I searched for this thread but it didn't come up. I was sure I had got the wrong ones also. I'm going to call to verify.

Better if you send them a pic, they have a tech email on their website