If I were to put a LS6 intake and TB on my LS1 would I receive any noticeable gains? please help.

 

Throttle body is the same, intake may be worth 5-6hp (maybe) on your otherwise stock 1998 LS1, in my opinion. Not enough to feel. Now if you're planning on further modifications the worth of the LS6 intake increases.
Ed

 

I just installed the LS6 Intake manifold on my 1998 LS1 and I did noticed the throttle is more responsive than before. As far as night and day horsepower gains, no. But definitely noticeable. I kept my stock throttle body as well.

 

Did it fit easily? I tried to help another forum member with a 02 and the manifold didn't sit just right kinda rocked and had a vacuum leak.

I appreciate the response guys, did not know the TB's were the same.

Thank you.

 

are not the valleys slightly different on the 98 to 01s? so 02 and new intakes will not fit without modifications

 

The 2 will definately be a nice gain...id say around 20 hp ...10-15 for the ls6 intake, and dynos have shown around 5-7hp for the P&P tb

 

01+ LS1/LS6's had different valleys for PCV improvement. This does not affect intake manifold fitment. What does affect fitment is the coolant crossover tubes that run under the LS1 manifold. The LS6 IM has a lower floor which means that you'll have to buy the LS6 tube kit, or cut slots in the ribbing of the floor of the LS6 IM...

 

http://forums.corvetteforum.com/c5-t...fold-swap.html

 

You will not get anywhere near a 10-15 hp increase on a stock engine by an intake manifold change to the 2001+ version. When GM installed these intake manifolds on 2001+ engines, they also changed block design to decrease pumping losses and changed the MAF. With all these changes all they claimed was a 5hp increase at the flywheel. The same intake manifolds were used on all 2001+ LS1 and LS6 engines. A ported and polished throttle body MAY give a slight power increase on a stock engine, but primarily will give quicker throttle response. Where these things really start to work is down the line with some serious modding.
Ed

 

While I agree that addition modding, like a different camshaft will really enhance the benefit of the LS6 intake manifold, I'd also point out that the difference between 01-04 and earlier years is greater than that described above.

"The biggest change in the LS6 intake was an increase in plenum volume accomplished by dropping the plenum floor as low as allowed by the engine block valley cover. Additionally, sharp edges at the junction of the intake runners and the plenum were smoothed. Some dead air pockets (areas of no flow) were eliminated. This new manifold is worth 10 horsepower, just by itself. The new intake is so good, it’s not only on the LS6, but it replaces the ’97-’00 LS1 intake, too. "01 LS1s, got the larger volume LS6 intake manifold, and better flowing, but heavier cast iron exhaust manifolds, larger MAF (78 to 85mm), and slightly better flowing air intake box, but were then equipped with the same pre/pup cats the '00 California and NE United States sold cars got, as well as the smaller camshaft, similar to that of the 97-99 LS1. All of these changes combined for a net increase of 5hp, and 10 lbs.(auto) and 25 lbs. (manual transmission) of torque."

Above information taken from articles written by Christopher P. Endres, and Hib Halverson

 

Yeah, the torque bump is the most noticable improvement with a LS6 IM swap...

 

I agree! And it's the torque, not the HP that gives you that seat of the pants kick

 

Well aware of the ls6 intake and when they started putting them on vettes/fbods...Ported throttle body has been dyno proven time and again to add around 7hp...I saw a nice gain on my LS1. On fbodies the ls6 manifold it good for 10-15 hp and were talking about a vette w/ the same motor.

 

Well, I've got them both on my car (plus some other things-see sig) and have a very hard time believing I'd get 20hp out of only those two mods on a primarily stock motor. Primary reason I put the Shaner on mine was to quicken throttle response, and it did that nicely. I put the LS6 intake on when I did Blackwing, powerbridge, drilled foglight shrouds, H/C, headers, high-flow cats and GHLs to help it breathe. My whole air intake/outlet system is now pretty free-flowing and I do believe that at this time I'm gaining a nice bit of power and torque from the manifold. So, in that regard, and with those additions, I agree.
Ed

 

No issues whatsoever. Installation was simple and quick. I did have to change out the coolant/vent tube to that of a 2002 Z06. I'm sure the kit is the same for all 2001-2004 Corvettes.

 

Wow. The responses are great. I am trying to follow along. lol. So most have said on my 98 the 02 LS6 intake will fit with some modification. Correct?

 

The manifold is a direct bolt on. The one thing I did do with my swap was to change out the coolant vent tubes to that of a 2002-2004 Z06. I also changed out the intake manifold gaskets. I am not one to reuse gaskets if it can avoid any problems. Some may not agree, but it is what I prefer.

 

The LS6 intake manifold I have is complete with fuel rail and injectors. What do I do to switch it over? Mine has two lines this one had one?

 

I used my original fuel rail with injectors. I was told that if I use the LS6 injectors, I would have to get a tune. I plan on using the LS6 injectors on a later date when I upgrade the heads and a cam.

 

i hadn't heard anything about a tune if you upgrade the injectors. Since I haven't gotten very much input on this I may just keep the injectors I have hooked up. Anyone? Any help???