Turbo headers??

If I decide to make my own, I figure it may be a good idea to modify existing headers.

Here is my question, is it possible to modify any small block chevy headers, or do they need to be LTx specific? If I can find a header that fits good (whether flipped up side down or not, and just weld ona vband flange) then thats what I want to do.

The headers that fit my application are from a 96 Chevy 305 truck flipped around.

I'd like to see pics. I tried to do that but it got to the point that they had to be so extensively modified that it was easier to build from scratch. Plus the flanges on those small block headers are only 1/4". I would think they would warp pretty easily. The room in the Fbody engine compartment as you know is pretty small, and then you have to deal with the accessory bracket on the passenger side. There is no flipped shorty thats going to clear that. I did see a pic of a car with block huggers flipped upside downwith the turbo flanges welded right on, but it was in a truck and had lots of hood clearance.

Bill

You could prolly weld up a driver's side header, and pipe the existing passenger side down under the AC compressor and over to the driver's side. I think Jordan did it that way his first time. Here's a link to his t76 system http://fastblackcar.com/camaro/turbomotor/TurboKitForT76/turborouting/

I was talking a twin setup, but I suppose a single might be do-able like that. You would have to have the passenger side go back behind the engine and up to the other side because with the pass side forward swept, it will run into the accessory bracket. A single cat drivers side manifold on the pass side might work, as it goes pretty much straight down at what would be between #2 and #4 cylinders (if it was on the pass side). Then run a flipped shorty on the drivers side.

It would be a tight fit trying to fit a cross over and a down pipe on one side of the engine, especially in a 4th gen engine bay. I think it would be easier to run the cross over around the front of the engine along the front of the K member. A tubular unit would definately help. :)

It would be a tight fit trying to fit a cross over and a down pipe on one side of the engine, especially in a 4th gen engine bay. I think it would be easier to run the cross over around the front of the engine along the front of the K member. A tubular unit would definately help. :)

something like this? http://fastblackcar.com/camaro/turbomotor/TurboKitForT76/turborouting/DSCF0180.JPG

I think what I was trying to say was if you ran the manifold on the pass side you would be able to run it forward, the exit of the manifold would be toward the front of the car that way. I'm not sure if it would clear the motor mount though.

my buddy flipped the slp headers to make his kit for his single T88

Single cat or dual cat headers?

Thanks for the responses guys. my main concern was did they have to be LT1 headers, or will and SBC headers have the right spacing and bolt pattern?

Yes they will bolt up, May have to do some minor clearancing, but nothing major at all.

my buddy flipped the slp headers to make his kit for his single T88

How did he clear everything on the passenger side? Did your buddy take pics of his setup?

Thanks for the responses guys. my main concern was did they have to be LT1 headers, or will and SBC headers have the right spacing and bolt pattern?

they will bolt up, but lt1 heads are D shaped ports...while older sbc heads have oval ports...i dont know when the change was, or which headers will work...i was thinking about using lt1 corvette block huggers

Here are pic's of my custom single set-up. It's for a PT-76 GT-S. The passenger side header is missing, but it is a regular SLP shorty in the standard orientation. The driver's side header started out life as an SLP shorty, but I mainly just used the flanges and maybe 2" of pipe.

www.2weird.com/mike/pic1 mod.jpg

www.2weird.com/mike/pic5 mod.jpg

sleeperz28...is that a single blade throttle body? if so where did you get it(id like to pick one up for my t88 project. thank you.

Well I have pictures of the turbo headers for mine at www.eifba.net. The cover page, its Jake mysterious camaro. I hope it helps you or gives you any ideas.

Here are pic's of my custom single set-up. It's for a PT-76 GT-S. The passenger side header is missing, but it is a regular SLP shorty in the standard orientation. The driver's side header started out life as an SLP shorty, but I mainly just used the flanges and maybe 2" of pipe.

www.2weird.com/mike/pic1 mod.jpg

www.2weird.com/mike/pic5 mod.jpg

Just one question, why did you opt to only vent off of one half of the exhaust with the wastegate in the crossover? Otherwise looks interesting! Kinda resembles a turbo tech setup with larger tubing, hope you got a solution to the poor oil drain from the turbo in that location. You going to use a scavenge pump?

Bill

I have a few more questions:

1. How much power would I be giving up by using 1 5/8" headers that merge into 2.5" collectors (which will merge into a single 3" pipe before entering the turbo)with my 383LT1 T76 turbo project? Do I need to go 1 3/4" primaries that merge into a 3" pipe for each headers, and will it make a huge difference? I have AFR210's on my 383LT1 and I would like to make 700rwhp on 15psi (w/ 93 octane).

2. Anyone out there using 1 5/8"? The reason I ask is because it seems as though there are alot more header options with 1 5/8" primaries.

3. Are D port headers necessary? Some headers like SLP's arent necessarily D port if I remember correctly (when you actually look at them), so does it even matter?

Just one question, why did you opt to only vent off of one half of the exhaust with the wastegate in the crossover? Otherwise looks interesting! Kinda resembles a turbo tech setup with larger tubing, hope you got a solution to the poor oil drain from the turbo in that location. You going to use a scavenge pump?

As long as the wastegate vents upstream of the turbo, it effectively reduces exhaust pressure, thus flow, into the turbine. If the turbine ever required less than 4 cylinders' worth of exhaust, the flow could actually reverse in a small section of the crossover pipe between the wastegate Tee and the driver's side header. My bet is, though, that this would never actually happen.

I didn't realize that it's similar to turbo tech until long after I started it. It does, however, have much larger pipe, and a much larger turbo. As far as oil drain, I hope that it'll work Ok since the turbo is in the same location as the Vortech it replaced, and the oil drain worked fine then. If it doesn't work, I'll run it lower in the pan.

Mike

I have a few more questions:

1. How much power would I be giving up by using 1 5/8" headers that merge into 2.5" collectors (which will merge into a single 3" pipe before entering the turbo)with my 383LT1 T76 turbo project? Do I need to go 1 3/4" primaries that merge into a 3" pipe for each headers, and will it make a huge difference? I have AFR210's on my 383LT1 and I would like to make 700rwhp on 15psi (w/ 93 octane).

2. Anyone out there using 1 5/8"? The reason I ask is because it seems as though there are alot more header options with 1 5/8" primaries.

3. Are D port headers necessary? Some headers like SLP's arent necessarily D port if I remember correctly (when you actually look at them), so does it even matter?

I made my headers with 1 5/8" tubing into a 2.5" collector and then to the turbo flange. The next set that I'm going to start building here as soon as I get some supplies will utilize stainless round SBC flanges so I can insert the tube inside the flange and TIG it from the inside thus eliminating leaks. Stainless Works sells these flanges. They are a little pricy at $120, but they are stainless, and made for the 1 5/8th tubing. The D-ports even those made for 1 5/8 tubing will not allow the tube to be inserted in the flange without some creative "forming"

You are correct about the SLP headers, they utilize a rectangular flange that is used by the mid 90's Vortech trucks. As long as the port is larger than the exhaust outlet in the head, it is fine.

Bill

I made my headers with 1 5/8" tubing into a 2.5" collector and then to the turbo flange. The next set that I'm going to start building here as soon as I get some supplies will utilize stainless round SBC flanges so I can insert the tube inside the flange and TIG it from the inside thus eliminating leaks. Stainless Works sells these flanges. They are a little pricy at $120, but they are stainless, and made for the 1 5/8th tubing. The D-ports even those made for 1 5/8 tubing will not allow the tube to be inserted in the flange without some creative "forming"

You are correct about the SLP headers, they utilize a rectangular flange that is used by the mid 90's Vortech trucks. As long as the port is larger than the exhaust outlet in the head, it is fine.

Bill

Thanks Bill. You dont think 1 5/8 will be limitting on a 383?

Limiting, no, but you may have to see how well that size flange mates up to your ported heads.

sleeperz28...is that a single blade throttle body? if so where did you get it(id like to pick one up for my t88 project. thank you.

Yeah mono-blade from arizona speed and marine.

realquick
700rwhp on 15psi will depend on how well your heads flow. Unless they flow in the 300's I dont think you will make 700rwhp till about 18-20lbs.

Sup REAL QUICK. Its JDEIMOS140

Yeah mono-blade from arizona speed and marine.

realquick
700rwhp on 15psi will depend on how well your heads flow. Unless they flow in the 300's I dont think you will make 700rwhp till about 18-20lbs.

AFR 210's ported by lloyd Elliott:

............Intake.....Exhaust (no pipe)
0.200......143........103
0.300......204........141
0.400......247........173
0.500......281........198
0.600......308........219
0.700......311........227