I received my LG Pro's yesterday so I got under the car to take a look at everything. The only question I really have is if you pulled your heads to get this bad boys in???

I am planning on jacking the motor up an 1" or 2" but not certain if that is going to give me enough clearance to get these in.

Any other tips or comments please feel free to post.

Thanks in advance,

J.R. Thomas

 

I don't think you need to do either, based on what I've heard here (and saw an install on a lift). I'm sure others with more experience can chime in here. Good luck.

 

, also follow this and it will be relatively easy.
http://ls1howto.com/index.php?article=29

 

You don't need to remove either. The only things I had to take out were the coil packs and the steering linkage in addition to the usual suspects. I slid both of my LG Pro's in from the top. You can get them to go in from the bottom if you get the car high enough in the air, but it's difficult to do in a driveway. It takes some massagging, but it will go from the top.

 

We did two sets back to back on a 1997 and 2000 C5. Swapping the stupid AIR tube took more time than anything else. Requires removal of your intake...etc. The valve covers and coils are easier to do on 2000+ also. Overall time from start to finish in my driveway was ~6.5 hrs per car. Definitely something an avg mechanic can do themselves with a bit of help and/or patience. With a lift it should be much quicker.

 

I did mine in my garage with jackstands and the install went reasonably smoothly. I did end up having to loosen my starter as well as pulling the alternator, but never had to jack up the motor or anything. Make sure you have a buddy, and an inch-pound torque wrench!

 

One hint, use a socket that fits the temp sensor right near plug #1 and leave the socket on the sensor while you put in the header, a lot of guys have broke the sensor. Pull the plugs first too.

 

LG Pro LT's are easy to install on these cars! Right side down from top, left side up from bottom. All I had to do on my 01 Z06 was remove the plugs, coil pack on the right side, dip stick, alternator, and the little ground strap near the oil filter. A lot of stuff I seen said to remove the right valve cover, I didn't have to on my install. I was even able to get the left header up in there with as little as 15" under the car, the car was sitting on four jack stands. The hardest part is getting the old exhaust off.

My advice is if you don't own a set buy a set of Gear Wrench brand ratchet wrenches, they make life easy (or at least easier) when accessing those back bolts on the left side. Sears sells them. Don't use the gaskets that ship with the headers. Use the older style factory multi layer steel gaskets, they will leak. Just order 1999 coupe gaskets and you will get the correct round port gaskets, they won't leak and your bolts will stay tight. Your car will have the oval gaskets.

 

There is a good tip!

Things like those are easily broken if you let the header slip when installing.

 

Very good gentleman and ladies, if applicable.

I previously installed some TPIS' but I did these while I was doing a head and cam install.

You guys are the best and I will be sure to post my end results. I plan on working on them tonight.

Thank you for your time!!!

J.R.

 

i just installed some ghl by myself on the garage floor in all what an experience i dont think id every do it again. 9 HRS it took me and im exhausted

 

This is excellent.

 

I second that. I enjoyed the install until I had to pull the intake. What a pain in the ***. Not a lot of room for a guy with big hands, that's for sure.

 

If you have any questions during the install, feel free to give me a call, I would be more than happy to help anyone out.

 

Thanks Anthony, you guys are great to deal with!!

Great products you guys have there. I am looking forward to getting my G5X3 cam installed.

LG is the $hit!!!

J.R.

 

Did mine on jackstands. Pretty easy except for lining up the bottom flange bolts, which I've heard no longer exist. Did have to loosen the starter, but I don't understand what the intake manifold has to do with it....

 

Intake removal is on older C5 where you have to change the A.I.R. tube to the newer style C5 tube. LG ships the new style tube with the headers. That tube goes right behind the heads and intake and is very hard to access the mounting bolts. Removing the intakes makes accessing those bolt easier.

 

Congrats on the LG's!!! They're great headers, I just finished installing mine a little over a week ago. Use the directions from LS1howto.com & you won't go wrong. I also used the directions from cajundude's web site. If you do a search for a thread I started (I think it was "LG Pros...install ?'s" or something like that) you'll be able to find the link to cajundude's web site. Good luck and have fun!!!

 

I started the install at 1:00 Thursday afternoon, by myself in the garage.
Things I did for the install:
Removed Alternator
Removed Coil Pack
Removed Valve covers
Removed Steering linkage
Removed Driver side ground
Jacked up engine approx. 1" with intake on. (I did break my MAP sensor again being a bit too aggressive) $55 from Autozone.
Dropped the mufflers

DON'T FORGET TO GET YOU SOME 02 SIMS!! I was lucky I had an extra set of them in my tool box. YOU WILL ALSO NEED SOME EGR BLOCK OFF PLATES FOR YOUR HEADERS. I ALREADY HAD A SET.

Removal of old system:
The removal of the driver side header was a bit of a pain. I did have an extra set of hands there to help me out getting the old header out of the bottom. This is where having the motor jacked up was really helpful.

The passenger side was a breeze to get out by myself from the top.

It toook me about 1.5hrs to have the old system out.

Header Installation:
I did have the get the car off the ground another 6" because the LG's were quite a bit longer than my TPIS LT headers. Once again I did have help getting the driver side up from the bottom. It took me about 5mins to get the passenger side in. Don't forget to bolt your ground back to the motor (on driver side). There are 2 wires that you should be grounding.
Getting the headers in place and loosely bolted to the head took approx. 30mins.

O2 Sensors:
LG recommends that you discard the front 02 sensors and use the adaptor that comes with the headers to run the rear 02 sensors (since they are higher wattage!?) in the front 02 sensor location. The front 02 sensors have a flat plug that plugs into the harness. The rear 02 sensor has a squared plug that plugs into the harness. The adapter is so you can plug the flat plug into the harness with a square plug on the other end so you can run the rear 02 sensors to the in the front 02 location. It didn't make a lot of sense to me until I was actually down there and saw how easy it was. The harness that once had the rear 02 sensor pluged into it (square plug) is where you install your 02 sims.

The longest part of this was making sure none of the wires were touching the header. Since you are running the rear 02 sensors in the front you have an extra foot of cable from the wiring harness to the 02 sensor. I think I used 6 or 7 zip ties to make sure everything was clear of the headers.

You will be getting rid of the once, front 02 sensors. I just cut all the wires off of them and ran them in the rears instead of using the block off cap that they provided. These obviously don't plug into anything, theres no plug because you just cut it off!!

This whole process took about 1hr.

The rest of the Exhaust:
Everything lined up very well and slid right together. After getting everything loosely installed, the first thing I bolted up was the exhaust to the cat backs. Once I got the exhaust bolted to that, I went and bolted my mufflers back up. Afterwards, I went and torqued down my headers. I tighted up all 6 clamps that were provided with the exhaust system. Lowered and bolted the engine back down. Reinstalled alternator, valve covers, coil packs, and steering linkage.......... DONE!!!

This took me about about 1.5hrs including removing the jack stands and double checking that everything cleared the exhaust.

So it took me less than 5hrs. I was very impressed with the fit and finish of the LG PROS. I'll be taking my car to get dyno tuned tomorrow to see what I picked up vs. the TPIS LT, Random Tech Cats, and X-pipe.

Also, I want to thank the guys at LG for answering my eleventy (ha!) questions. You guys are very impressive and it seems like you really care about other peoples projects. That is hard to find now a days at other shops. Thank you!!!

Respectfully,

J.R. Thomas

 

instead of removing the intake, I cut my old air tube, vut the new one and used high themp hose to join them Actually, it makes plug changes easier as you can remove the tube at the header flange and get more room...

if I had to do it all over again, I would weld braces to the air tube flanges....to make sure they never break off. I have older LG pro