55chevy

iTrader: (6)

Will do, it will be later this evening.

55chevy

iTrader: (6)

StickSS: Here are 2 pics of the outlet. The distance from center to center of the studs is 3 5/8". The beveled gasket edge is 3/8" thick. I remeasured the outlet and it is 2" and I don't think you could open it up any since it is the same size going up into the collector. I hope this helps.

TAQuickness

iTrader: (28)

As far as Fbod manifolds:
98-99 are the same, air and egr provisions
00 air and egr provisions, egr is different hook up than 98-99, air flanges are rotated 90* from 98-99
01-02 air and NO egr provisions

StickSS

Thanks for ths info 55 Chevy. From the pictures it looks like they can't be modified. I don't know why GM built good manifolds with only a 2 inch outlet. It kind of defeats the whole purpose. Probably something about them wanting the Corvette to dyno higher than the GTO and Fbodys. The lS2 in the GTO is rated the same as the Vette I think but no way it would make the same power with those choked up manifolds. I think the truck manifolds from 03 and up are the next best choice for conversions because they don't have air and EGR ports. Maybe some on can messure the distance between the studs and the outlet ID diameter and post a picture like you did for everyones information. Thanks Bye

jimmyp

iTrader: (1)

found these cts ones on ebay today, look pretty tight fitting but probably not very good flowing:

http://cgi.ebay.com/ebaymotors/LS1-L...91864444QQrdZ1








here are some 03 vette ones for comparison





also just wanted to add some more info, my 02 fbody manifolds were a full 2.5" in diameter at the exit/flanges.

jimmyp

iTrader: (1)

some more cts ones with lots of pics

http://cgi.ebay.com/ebaymotors/Cadil...91533296QQrdZ1

Stu Cool

iTrader: (13)

Has anyone tried cutting the large collector flange off of the cast iron manifolds and brazing a smaller one on? Not talking about reducing the diameter, but the flange plate on the driver's side on some of the manifolds is huge. If it was smaller it might fit in tighter spaces around steering and frame rails.

Pat

StickSS

Thanks for the info Jimmy on the Fbody manifolds. I wasn't sure that they were 2 1/2 inch. Those 03 vette manifolds look different from the Z06 ones. 03 they must have changed them or only used them on regular Vettes. Do they have air fittings and O2 bungs on Both. Are they Stainless Steel? If you still have them, can you see if they are 3 inch outlet? The reason I ask if they don't have air fittings you will be able to pass a visual inspection if they look under the hood? The Fbody manifolds you have to use block off plates and they could fail you if they get technical. the outlet on the 03 Vette looks to be more rearward may work in a lot of chassis. Bye

55chevy

iTrader: (6)

These may flow pretty well, I asked for the measurements of the them and here is the seller's reply:

Outlet ID measures 2.625" Outlet flange bolts are 4.562" apart. The flange itself measures 4" x 6"

crewchef

iTrader: (6)

Right side manifold off 00, no O2 bung? Where is the bank 1 passenger side O2 sensor normally located at? Picked up set of manifolds from a 00 TA and just noticed drivers side has bung but passenger side doesn't. Going without CATS and will have to fab pipe down to current exhaust so I've got a place to put a one but wondering where it should go. Shouldn't both sides be close to the same distance down stream?

digitalsolo

iTrader: (24)

The stock pipes put it JUST below the manifold on the cat/downpipe. It's within an inch or so of the drivers side position.

StickSS

Hi Crewchief: Looking at the pictures of the 01-02 Fbody manifolds that were posted up at the beginning of this tread. There looks like there is a boss in the passenger side collector where you could place the O2 sensor. If you had a drill press with the right size bit it wouldn't be to hard to do. You would have to weld in the O2 bung. I don't know how hard this is to do with the cast iron manifolds if anyone has done this. I think that the 98-99 manifolds are stainless steel so they would be easier to work with. The Pacesetter shory style Fbody headers which they call mid tubes are a special design and may work for people if the 98-99 Fbody manifolds fit. Looking at the picture these headers come with a shorter down pipe that you weld into the stock converter. They have a longer collector flange on the passenger side with the O2 bung welded in all ready. These might be a way to go. Maybe you could special order a set with out air and egr fittings and coated from them directly. just giving you ideas to play with. Good Luck

FastKat

iTrader: (10)

These ones on the top are def not CTS-V manifolds... they're either Fbody or 5.3L truck manifolds.

TJ

iTrader: (10)

fastkat- are those vette headers stainless, or cast?
those looke like 97-99 vettes to me. the 00 was a special year of the cast, and the 01-04 are the same cast iron manifold, AFAIK. ive got 4 different sets, and they are all cast, except the 97-99 versions.

FastKat

iTrader: (10)

Not sure... I remember reading that the early vette manifolds were a 2 piece mild steel unit where they actually created a design where there was one manifold inside the other, to make air pockets for some reason or another... not sure how accurately I remember it, but I am pretty sure the early ones were mild steel.

As far as those manifolds, I don't know... however I am becoming more skeptical after seeing those 5.3L truck manifolds trying to be sold as CTS-V manifolds on eBay.

TJ

iTrader: (10)

if you need pics of the cast iron 01+ manifolds, shoot me your email, and ill get you a pic.
dont want you to get ripped off.
the vettes are harder to fit a chassis, but are worth a few hp over the stock truck and car shorty manifolds.
good luck.

LS2 V8 Miata

Here's a photo of the exhaust manifolds on a new GM crate LS2 in our shop. These work fine in the tight quarters underhood in a Miata, I'm sure they'd fit well in any other GM car. The O2 sensors are located close in at the 4 into 1 convergences in each bank. These manifolds flow well enough to make 400 HP in this stock LS2 with small "D" exhaust ports. Imagine what they could do if you increased the port area about 35-40% which is what's available if you simply port matched the heads to the manifolds!

FastKat

iTrader: (10)

Those look like they'll give you A LOT of flexibility with engine swaps?! What's the catch?!

Hate to ask, but would you be able to post a picture of the manifolds on the engine from the front? I want to see how much they stick out from the block. Thanks!!

TJ

iTrader: (10)

dont be fooled. it is a 2 piece manifold design, AFAIK.
there is a bottom piece that connects to the actual manifold.

yodawagon

check ebay. a few for sale on there.