Hi,

Are there any visual differences that distinguish the LS6 and LS1 Intakes?

My car is a 99FRC, but I had a friend comment last night that it had an LS6 Intake on it, and I wasn't aware of that upgrade when I bought the car.

Thanks.

 

http://www.thedetailzone.com/LS6%20Intake.htm

 

I don't see how he could tell with the intake installed. The exterior visual difference is the bottom of the intake.

 

Unless the previous owner swapped it over and you can verify that fact, it is difficult to tell one from the other. What appears to be a part number cast into the plastic is no help either as that is not really a part number per se. It is actually a "casting" or "engineering" number used internally by GM and not the actual number one would use for ordering a manifold.

Since it's obviously mounted on the car and you can't really see the underside w/o removal, one way you can get a good IDEA as to the type manifold is to look at the small metal water lines bolted to the front of the heads, beneath the throttle body area. On an LS1 set-up, there is one metal line that "Ts" off and goes back up under the manifold itself (where it connects to the rear at another "T"). Since the Z06 manifold is flat underneath, it prevents using this stock LS1 metal water line arrangement UNLESS someone has done some grinding underneath of the Z06 manifold to allow it's use.

Most guys don't want to go to that much trouble modifying the underside of the Z06 manifold and will instead go ahead and use the Z06 style water lines that DO NOT have that portion that runs up under the manifold. This is what I and many others did when installing a Z06 manifold as it's much easier and not much money. So look at your water line setup closely. Just follow the small water hose that comes off your throttle body and connects to the small metal lines near the front edge underneath the manifold area. If the small metal lines ONLY connect to the right and left cylinder heads WITHOUT having a third "leg" branch off and run back up under the manifold out of sight, you have a PROBABLY have a Z06 manifold.

All that being said, the only way to 100% be sure is to remove the manifold and look at the bottom side.


HTH

 

Wow..thanks guys for such a detailed reply.

He mentioned something about the EGR hole, and how mine didn't have anything "plugged in", but I didn't really have any idea.

 

Your friend sounds like a Camaro/Firebird fan.

The Corvette version of these manifolds do NOT use an EGR set-up like the F-Body cars and therefore your manifold has no EGR "hole" for that connection when it's manufactured.

BTW, your throttle body is a "drive by wire" design, meaning there is no throttle cable actuating it like the Camaro/Firbird guys. The Corvette throttle body is actuated by an electric servo-motor and controlled electronically and is not inter-changeable with a F-Body throttle body.

HTH

 

Actually..he is!

He does a lot of installation/tuning of those cars, and has worked on just a few corvettes. But mainly because there are not too many in my area.
I am planning a header install this weekend, and he will be doing most of the work. He also has a wideband, and says that tuning it should not be a problem as it has a port on the headers for it. I am also putting on Hi-Flow cats, so he doesn't antcipate any codes, but says that he can take care of any if needed.

Thanks for all of your valuable input.

 

Sounds like your having fun. Give us a holla when you get everything done and let us know how you like it.

 

Gotta love the comparison pic...
"The intake on the left is an LS6. The intake on the left is an LS1."
OK, so which one is on the right?

 

Noticed that too did ya?

Although the pix aren't bad, they don't help when the manifold is bolted on to the engine and there's no way to compare side-by-side.

 

The top left picture has both intakes in it. The one left and one right. Does this answer your question or do I just not understand your confusion thereby being confused myself?

 

True, it's not a part number, but to the discerning eye, there is a corrolation. The casting numbers for the LS6 manifold (in between the injectors) are distinct, and different from an LS1 maniold. So, it is possible to visually recognize that it is an LS6 manifold, provided you have all the numbers commited to memory...there were quite a few.

 

I agree with the above and having access to all the numbers, etc is something not many have.

 

LS1 manifold number is on the passenger side and the LS6 number is on drivers side.