A few questions for a 5.3l in a '91

[98LSSOMO]

Couple of things to be aware of with the L33, based on my experience with an LM4. Chances are, the engine accessories are the same since both engines were for AWD configurations. The bottom 2 bolts for the a/c compressor goes through the compressor bracket and bolts into the side of the pan. Switching to any other pan will render the a/c bracket and compressor useless as no other truck bracket will fit. Also, the PS pump and reservoir interferes with the steering box.

I found out the hard way and ended up getting a used set of LS1 Corvette accessories. I like the idea of the lighter weight aluminum block in the S-truck. However, do not pay extra for the AWD truck accessories as they will not be of any use.

HTH

[low91]

It's gonna come with truck 2wd accessories so I should be ok as far as the PS pump goes. I didn't know that about the a/c compressor though that really sucks I wanted to be able to lay it out, I guess I could have went with the f-body pan and ran w/out a/c but I just finished notching my frame for the compressor. Anybody know of a way around this?

Can I just connect the fuel lines to the filter with fuel injection hose and clamps instead of using the quick connects? Then just run Hose from the filter to the rail ?

[98LSSOMO]

I am not 100% certain on this, but AFAIK, all aluminum blocks come out of the same mold. The iron-block truck a/c bracket will not bolt up to the aluminum block. You have to use the a/c bracket off of an aluminum block. The choices are F-body and Corvette LS1. The F-body alternator interferes with the steering box, so that leaves the Corvette accessories. Another option is to keep the truck Alternator/PS and buy an aftermarket high-mount a/c bracket and Sanden compressor (about $425). However, the compressor interferes with the overflow bottle which happens to be the mounting point for the ECM. Sure the bottle can be clearance and patched, but I just decided to get the Corvette accessories.

I bought the 4WD accessories with my engine, then bought a Silverado alt/PS brackt with a PS pump before I decided to go Corvette. Unless you plan to complete the swap in a few weeks, avoid all the headaches and extra wasted co$t and search for the Corvette stuff. I found everything I needed on C6 Corvette Forum | 2005 Corvette | Pictures | Photos | Forum | Forums. Lots of folks on there that sells used parts.

[98LSSOMO]

Oops! Just realized your 91 is not a S-truck so some of the clearance issues with the steering box and overflow bottle might not apply as it did with my Sonoma.

[RedHeartbeat]

Yeah, I have a C1500 93 model with Fbody accessories and everything works fine except the a/c compresser mounted low against the frame. I went with the Street and Performance High right side mount with the Sanden compresser. That kit is around $650.

[LS1GMCTruck]

Yeah, I have a C1500 93 model with Fbody accessories and everything works fine except the a/c compresser mounted low against the frame. I went with the Street and Performance High right side mount with the Sanden compresser. That kit is around $650.

X2...

[low91]

Will my transmission yoke work or will I need one from a 4l60e?

[low91]

Oops! Just realized your 91 is not a S-truck so some of the clearance issues with the steering box and overflow bottle might not apply as it did with my Sonoma.

Lol you had me scared for a second.

The S&P kit would be nice but I can't convince myself to pay that much to have a/c, 7 years without it in this truck so whats a little longer.

Heres a few pics of my a/c notch. I know the welds might look like $hit but there solid. Think everything will clear?