FBJR

I have a line on 2 or 3 LSx exhaust manifolds for my G body swap with a 5.3 LM7.

There are the Camaros, Vette and GTO manifolds. (did all have the cats right below them?)

I guess most have used the F bodys. The Vettes look OK but seem to exit quite a bit forward.

The GTOs look good and come out forward of the rear port vs the F body.

So have any used the GTOs and like them over the F bodys?

Thxs!!!!!

96lt1m6

iTrader: (31)

if you can get the 6.0 truck manifolds to fit,i think those are the ones to use!

FBJR

I got a killer deal on a set of the GTO manifolds from a member here.

As long as they hug the block a little better I think I will be fine. Didn't need much and these look tight.

Nice thing is the truck only has a single cat with a Y pipe which will be alot easier to do for this Ca ride. Plus the Elky is rated as a truck to making smog easier all the way around.

Any other input is welcome always!!

FB

Oscar Will

I used the 1997 Corvette "sheet metal" manifolds, they seem to flow ok, tuck in nice & tight.......and don't leak.

FBJR

Nice setup and no smog which I do have to deal with!

I have the GTOs, they tuck in well and are light. Has anyone used them on a G bady before?

I wonder if the F bodys are better flowing.

Other option are the Patriot Mids that look nice with a long collector; http://store.summitracing.com/partde...46%2D1&FROM=MG

Anyone tried those?

FB

philntx

iTrader: (8)

These are the same as the 4.8 and 5.3 manifolds.

TJ

iTrader: (10)

6.0 manifolds have 3" exit, where the others are 2.25 or 2.5?
not sure of the year, but i think 04 and newer are the cleaner manifolds to get, no egr.

i had a set of z06(all 01-05 c5) manifolds, and i think they flow the best out of them all. hard it fit item, though.
i didnt pick up much with long tube headers over the manifolds.

FBJR

I have the 5.3 on it and just measuring it doesn't look good. As well as the forums here say they don't fit.

The 6ltr is only another 45 ci so I doubt they have a special manifold for them or even the 6.2.

Does someone have a set of both the truck and F body they can lay side by side to compare like the oil pan thread?

FB

91parkave

iTrader: (4)

Corvette manifolds have smaller primaries than than the truck manifolds, the truck manifolds dont hug the block as much as the fbody or corvette manifolds do, But any of them can be hacked up and welded, i welded a 2.5 downpipe to each truck manifold to get it right.

G-Body

iTrader: (4)

The truck manifolds do not fit in the G-Body, they truck manifolds hang further off the block than the f-body ones and are too wide for the frame rails.

The 6.0L trucks did use different manifolds that had larger passages, the turbo guys like them for front mount twin setups.

I have a set of truck manifolds laying around that I can measure, but the f-body ones are in my car so I can`t really do a side by side. IIRC I think someone already posted a side by side on here. I`ll see if I can did it up.....if I don`t fall asleep first.

FBJR

That would be cool. I have gotten alot from you already G Body

As I said I have the GTOs and they would fit with no problems.

The mid headers may fit, trying to get more from the manufacturer now. But then again for a daily driver the GTOs or 6ltr might be better.

I had the 6ltr and traded the truck after 6 months for a Duramax I get 50% better mileage and fuel is 10% more (no brainer) and has more power than anything I have ever driven.

FB

1tigers

I think almost all of manifolds are cast iron. Have you ever tried to weld cast.Some corvette's had steel

91parkave

iTrader: (4)

johnnywhale

iTrader: (3)

I've got a set of new take off Corvette manifolds if you're interested. They do have AIR, but you'll need a block off plate, as seen in the pictures above. Make an offer.
Johnny

thequietplace27

hey, i put a 05 5.3 in my 77 firebird, and i've been drivin it with the exhaust welded to the stock manifolds, cuz i had to remove the collector part to clear the frame. but it has cracked off twice now, so i tried shorty headers for a truck, but they are too wide, they hit the heater box, and the frame a little, so i tried modifyin them, and they got in the way of the back spark plug wire. so now that i'm suicidal, can any one help me? i've seen some stock steel manifols. is that what i need? or do some cast ones for some car work?

subtlez28

iTrader: (15)

Are the 6.2L L92 truck manifolds desirable?
403 stock HP, I assume they flow.
I have a few sets laying around.

FBJR

You can get a nice set of headers made for it, ceramic coated for under $500. I went with the mids from BRP and they look great.

fenix999

iTrader: (17)

I have flanges for the stock manifolds that allow you to weld pipes to my flanges and then bolt up that section to your cast header. I have flanges for stock truck manifolds and firebird/camaro stock manifolds. they work awesome. They are made of 3/8" steel and have a true 2.5" center section for better flow. Stock manifolds are like 2 1/4 or something smaller like that.....truck manifolds are exactly all the same even on the new 6.2L trucks. They flow wel enough to support 1000hp in a turbo setup so yeah, they WORK lol

xdanny510x

Sorry to bump this thread back up from the dead but do exhaust manifolds from a ls1 fit a silverado? Im trying to go back to stock and have the y pipe and cats but no exh.manifolds