DeanHensler

Are they the same or different? If different, where can I see a picture of the LT4 manifolds?

T/A KID

The LT4 headers are different. They look more like the LS1 style headers, resembles shorty headers.

DeanHensler

Anyone know where there is a picture of the LT4 exhaust manifolds?

Injuneer

When SLP built the 97 LT4 cars, I thought they took stock design F-Body LT1 exhaust manifolds cast in stainless steel, and extrude honed them.

Ultra_Dog

I have an extra pair of SLP LT4 exhaust manifolds. They look identical to the standard LT1 mainfolds, except they are cast in stainless steel and have been extrude honed. They are heavier than the stock castings and SLP reportedly found good HP out of them. They work very good. I had them installed when I went with LT4 heads/intake and hotcam. Since I moved to an ATI P1SC, changed the cam, etc., I went with a set of shorty headers.

I plan on pulling the headers and going back to the manifolds at some future point.

I'll try to reply back with pictures.

T/A KID

I am almost Positive the Exhaust Manifolds are different, but I have been proven wrong before.
Take a Look at the engine cutaway http://www.grandsportregistry.com/lt1vslt4.htm The Manifolds look more the the LS1 manifold and they don't resemble the LT1 manifolds.

Ultra_Dog

http://www.carcraft.com/roadtests/908/photo_08.html

The GrandSport is a Corvette (duh) and uses different manifolds than were used on the 1997 Camaro SS LT4.

Below is picture from CarCraft.

http://www.carcraft.com/roadtests/908/photo_08.html

Javier97Z28

That's b/c Corvette and F-body LT1 exhaust manifolds are different I believe.

Don 97 SS

Those pics are from GM promotional material and the 97 brochure. Regrettably GM, as most manufacturers, state such documents are subject to change without notice. Such is what happened with what was advertised and as to what actually happened for 97 SS.

A vast majority of 97 SSs did not get "high flow" (extrude honed) or stainless exhaust manifolds moi included when I ordered mine and eventually took deliver in February of 97.

Referring to GM promotional or vehicle brochures for specific options and details can be iffy. Another clear example is the Chevy brochure describing the 67 Vette that shows the 'new' ralley wheel as being painted black with chrome caps and beauty rings. All ralleys in fact were painted silver. I still have the original brochure of my 67 vette. The brochure was dead wrong as to what was actually provided.

Injuneer

The engine in the Carcraft photo is clearly a Corvette engine, not an F-Body engine..... look at things like the location of the accessories (e.g. alternator) and the location of the fuel line connections. That it the Corvette configuration.

Don 97 SS

Yes, the engine pic is not from an f-body.

sbs

They used the stock GM LT4 cutaway for that pic. I'm not surprised that GM didn't make a whole new cutaway just to show an F-body accessory configuration.

That picture doesn't say anything about the picture and text that he linked to, which shows and describes "stainless steel high-flow exhaust manifolds." Those are not from a vette.

173rd

LT-4 Manifolds-----I have a brand new set if anyone is interested.They are stainless steel and come with all gaskets.Some information the 96SS only came with Extrude honed manifolds on the first few SS,s produced mabe the first 40 if that many.No 97,s came with them.All so the 97,s came with a cone in the exhaust to guiet them down some from the 96,s. Most 97 owners removed the cone when they found out about this.

LT4Firehawk

Just to make sure everything is clarifiied on this, there really is no such thing as an f-body LT4 exhaust manifold. All LT4 Firehawks & SSs had LT1 f-body exhaust manifolds that were extrude honed, which flow about the same as 96-97 shorty headers. Also, they were not stainless steel. Apparently this wasn't even originally planned for the LT4 Firehawk/SS, but SLP was having problems meeting the 330HP target number (mainly due to having to use the stock LT1 ECM program) and settled on extrude honing the manifolds to get them to the 330HP target.

foxbat

sarscasm (duh) is unwarranted...everyone is trying to help one another here.