Factory Exhaust Manifold Collector Size
05-19-2011, 08:14 PM
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Factory Exhaust Manifold Collector Size
Ive tried searching but heres the question.
Im not looking for any fancy exhaust manifold just to replace the original one due to a exhaust leak cause i snapped the bolt off..... So, Im going with a shorty header, which i believe is the same size as factory. I noticed for the collector option their is a 2 1/2 and a 3. Which one is factory size? And does anyone knoe any company that has them for cheap
93 LT1 Auto
Im not looking for any fancy exhaust manifold just to replace the original one due to a exhaust leak cause i snapped the bolt off..... So, Im going with a shorty header, which i believe is the same size as factory. I noticed for the collector option their is a 2 1/2 and a 3. Which one is factory size? And does anyone knoe any company that has them for cheap
93 LT1 Auto
05-19-2011, 09:24 PM
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05-20-2011, 02:14 AM
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05-20-2011, 02:19 AM
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http://www.summitracing.com/parts/PSM-70-1340/
2 1/2 Collector
http://www.summitracing.com/parts/DOU-D3330-R/
3 Collector
Which one is stock collector size
2 1/2 Collector
http://www.summitracing.com/parts/DOU-D3330-R/
3 Collector
Which one is stock collector size
05-31-2011, 11:55 AM
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06-08-2011, 03:01 AM
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Taken from
http://forums.corvetteforum.com/1558875229-post11.html
http://forums.corvetteforum.com/1558875229-post11.html
NOPE!!! I'm just WRONG as HECK.Those are just like the ones I have.... I just remembered them WRONG.
I got to be getting that oldtimers disease.
#%@%!@$ I hate it when I'm wrong.
Mia Culpa,Mia Culpa.
I just got back from the garage where I checked and MEASURED the port sizes on the LT1/LT4 exhaust as well as the L98 exhaust manifolds.
Here's the LT1/LT4 exhasut port sizes.
Yes, there is a GIGANTIC middle port that would be split by the seperator in the head....
LT4/LT1 both end ports... 1 7/16 x 1 9/16
Middle Port.....................1 9/16 x 2 1/2
Exit Port at the collectors.... 2 1/2"
L98 ALL ports 1 1/4" kind of square... round edges in the corners
Exit Port a the collectors.......2 1/4"
L98.....There are TWO of the tubes (on each header) that are squished down looks like to clear the heat shields
The LT1/LT4 exhaust manifolds DO LOOK, TO ME like they would flow a little more than the L98 shorty manifolds.
A LOT more maybe????
The L98 headers are poorly made with a lot of weld covering the port in the exhaust manifold. I don'y know how much there is to gain by cleaning that up but I did it to mine. Probably about 1/2 HP gain for all 8. Not worth all the grinding and sweating, LOL.
The LT1/LT4 exhaust are a lot nicer made piece IMHO.
The LT1/LT4 exhaust manifold HAS a center port 'injection' fitting for the A.I.R. system. I only checked one of mine but I think they have 'one each' of these holes in both manifolds.
Knew I had those back for there for something, guess I just forgot what they looked like and I still don't remember why I have them. Must's been planing something for my L98.
Sorry for the erroenous info above guys. Memory ain't working good as it used'ta.
OH, head port exit sizes..I almost forgot.... I JUST measured these also.
128 Head Exhaust ports..... 1 3/8" x 1 5/16" 'Square" ports....rounded a little in the corners
113 Head Exhaust ports...... 1 1/4" x 1 1/4" "D" shaped ports.
Again, sorry for the wrong info I posted, guys.
I got to be getting that oldtimers disease.
#%@%!@$ I hate it when I'm wrong.
Mia Culpa,Mia Culpa.
I just got back from the garage where I checked and MEASURED the port sizes on the LT1/LT4 exhaust as well as the L98 exhaust manifolds.
Here's the LT1/LT4 exhasut port sizes.
Yes, there is a GIGANTIC middle port that would be split by the seperator in the head....
LT4/LT1 both end ports... 1 7/16 x 1 9/16
Middle Port.....................1 9/16 x 2 1/2
Exit Port at the collectors.... 2 1/2"
L98 ALL ports 1 1/4" kind of square... round edges in the corners
Exit Port a the collectors.......2 1/4"
L98.....There are TWO of the tubes (on each header) that are squished down looks like to clear the heat shields
The LT1/LT4 exhaust manifolds DO LOOK, TO ME like they would flow a little more than the L98 shorty manifolds.
A LOT more maybe????
The L98 headers are poorly made with a lot of weld covering the port in the exhaust manifold. I don'y know how much there is to gain by cleaning that up but I did it to mine. Probably about 1/2 HP gain for all 8. Not worth all the grinding and sweating, LOL.
The LT1/LT4 exhaust are a lot nicer made piece IMHO.
The LT1/LT4 exhaust manifold HAS a center port 'injection' fitting for the A.I.R. system. I only checked one of mine but I think they have 'one each' of these holes in both manifolds.
Knew I had those back for there for something, guess I just forgot what they looked like and I still don't remember why I have them. Must's been planing something for my L98.
Sorry for the erroenous info above guys. Memory ain't working good as it used'ta.
OH, head port exit sizes..I almost forgot.... I JUST measured these also.
128 Head Exhaust ports..... 1 3/8" x 1 5/16" 'Square" ports....rounded a little in the corners
113 Head Exhaust ports...... 1 1/4" x 1 1/4" "D" shaped ports.
Again, sorry for the wrong info I posted, guys.
