? for gmcwantsls1 on A/C in older truck

[Big Bodie]

Hey gmcwantsls1, I need to know what type of A/C compresser you used in your GMC truck with the LS1 engine. I heard the orignal type in older trucks is a expanison valve type and the newer ones are different. Did you use the orignal comp. from LS1 with your truck ?? Also did the comp. clear the cross frame rails ?? I'm getting ready to install a 2004 5.3 Chevy Truck engine & 4L60E trans. in my 81' GMC Stepside with in the next few months and I want it to go right. I'm going to use Dakota Digital dash which works great for LS1. I've already installed a 2000 LS1 in a 90' Chevy and went to the DD dash, that took care of the speedo problems. What about your motor mounts ?? Thanks, I'll keep the progress posted.

[GMCwantsLS1]

I used the compressor that came with the 2002 Camaro engine I bought for the swap. If your truck has the factory AC system then it uses an expansion tube that will work fine with the swap. I had to modify the engine mounts on the compressor side to make it fit and grind off a tiny bit of the frame. I don't think the truck compressor will work as well because the hoses will hit the frame. I don't think the Camaro compressor will work with the truck accessories (but I don't know that for a fact). The compressor fits very tight in the frame rails but has 1" or more clearence all around it. You will of course have to make custom hoses for the install. For motor mounts I made adapter plates that bolt the LS1 to the stock V8 mounts. http://www.ls1truck.com/jeff/template.jpg
I also had to cut a boss off the passenger side exhaust manafold and have it welded up.
Let me know when you need more help or pictures.

[Big Bodie]

Thanks for the info Jeff, I would love to see more pic's. What did you do about fuel delivery, pump, lines, filter, etc. I have 2 tanks. Where did you put the PCM ?? Did you do your own wiring harness ?? I have all the wiring diagrams for a 5.3. This conversion will be different that we did in the 90 Chevy truck. I don't mind notching the frame, I'll just brace it up again. Thanks for the motor mount diagram.