i have a 1999 hardtop and ive talked about it a few times, but now i know im getting the ls6 manifold and i have to replace my injectors i was told. so im really broke and dont want to pay 300 for this install, id rather do it myself. est time it should take me to do and details would help, thanks

 

Just take your time, mark all connections and torque all parts down correctly.

You can do it

 

Who told you to replace your injectors and why?

Here's a how-to on the intake swap.

http://ls1howto.com/index.php?article=5

Also, here's an injector swap I posted.

http://forums.corvetteforum.com/show..._id=103&arch=1

 

Wow, is that what they charge these days? I'm pretty sure I can change one in 10 minutes. Well, moving all the parts from the old one to the new one, better say fifteen minutes! If you can do the simplest of work you won't have any problems, it is super easy on these cars. Unlike the old small block days where you had to deal with oil, water, and air and really crappy gaskets now days with the LSx engines you only have to deal with air and they have really nice O-rings for gaskets. I always reuse the gaskets as long as I don't have to take them out of the intake. If you buying a new intake I would not reuse the gaskets out of the old intake, but if your getting a used intake and the gaskets are in place and look good I would reuse them. They are kind of high priced for O-rings. If for any reason the used gaskets leak it is no big deal to replace them. When removing the intake, remove all the wires and hoses that you can see hooked to the intake, leave the injectors and fuel rails on the intake. Remove all the bolts you can, the last two won't come out so just loosen them all the way and hold them up. Lift the intake an inch or two and pull it forward about two inches, then reach behind the intake and unplug the MAP wire, one small vacuum hose and the large brake booster hose. I always pull the check valve out of the booster and leave the hose attached to the intake when I pull it. When reinstalling simple reverse the process. Make sure your last two bolts are in the intake when you install it because you can't get them in later. When you tighten the bolts GO SLOW and work from the center and X from side to side until you get to the end, then start again in the center. Only turn then like a 1/4 turn at a time, make several passes to make sure the intake come down even. Don't over tighten the bolts! It don't take much to hold these intakes down.

The best I remember you will need to replace the water tube under the intake for the LS6 intake to fit where a LS1 intake was. Can someone who knows for sure verify this?

You will need a special tool to remove the fuel hose. I think Auto Zone sells the tool for under $10. It is a small two piece aluminum tool that pivots in the middle and has what looks to be a 1/2" long split metal line on each end. You simply snap the tool around the metal fuel line, push the braided fuel line like your trying to put in on, pull the remover tool out while holding the braided line in, then pull back on the braided line and it will come right off. Keep a rag around the hose so it don't spray fuel in your face!

Good luck

 

thanks guys. also, whats the difference between the ls6 motor and the ls1? just the manifold??? i know injectors are bigger, not sure what else.

 

basically the Ls6 has better heads,bigger cam,better intake,better exhaust manifolds and the block has windows for better oil circulation.Early Ls6 motors made 385h.p and later 405.JER

 

Heads, cam, and intake was the big things. The blocks have a window in the webbing that allows air to move between cylinders which makes then a little better at high RPMs and a little weaker than a LS1 block. Little different PCV system. I'm pretty sure the injectors are the same as the early LS1 and all later LS1. I think only the 98 and 99 came with the smaller injectors. Which were just fine until you start heavy modding and you run out of fuel.

 

do it yourself.. just take your time and it will be ok. one reminder i can offer is dont forget to connect the small vaccum line that goes to the back of the manifold..

 

Piece of cake just torque it down correctly and you will be good to go.

 

The best I remember you will need to replace the water tube under the intake for the LS6 intake to fit where a LS1 intake was. Can someone who knows for sure verify this?

Yes. You will need to swap your old coolant crossover tube to an ls6 style. It consists of blockoffs for the rear passages and a crossover for the front. You can get them at the dealer.

Jer.