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post #1 of 13 Old 06-23-2015, 11:24 PM Thread Starter
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Header question

I've seen some headers on my local craigslist and wondering if 1" primary tubes is still small? Thoughts on this?

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post #2 of 13 Old 06-24-2015, 08:34 AM
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Re: Header question

IIRC, the exhaust ports on the 2.8 are pretty small. I don't remember exactly how small but 1 inch may be close. I have a set of header flanges at the shop. I'll check the size at lunch time.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #3 of 13 Old 06-24-2015, 08:38 AM
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Re: Header question

That seems just a little small to me. Wait for Max to get back to you.

I do want to point out, a 1.5" tube is more than double the volume of a 1" tube. It may not seem like a big jump, but that is the math of volumes. So, figure it up rather than just think it is okay.

85 S10 Durango 2.8L extcab rwd 36k actual miles.
"true wisdom is knowing you know nothing" Paraphrased from Socrates
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post #4 of 13 Old 06-24-2015, 11:57 AM Thread Starter
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Re: Header question

Max that would be awesome if you could measure it.
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post #5 of 13 Old 06-24-2015, 02:33 PM
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Re: Header question

I did one step better.
I had an old set of rotted out Headmens that I cut the exhaust port flange off of. I checked it at lunch, the ports are 1.25"
(1 1/4").
Kricket is right. 1" does sound small.

Reece, you sure it was 1 inch? I have installed several sets on various 2.8/3.4s, I don't remember seeing any that small. I remember all of them being the same size tube as the actual exhaust port. Maybe the seller is mistaken(?)
How much are they?

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #6 of 13 Old 06-24-2015, 04:17 PM Thread Starter
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Re: Header question

I haven't seen them myself, i asked the guy how big they are. i'm guessing he measured the ID at the flange. There $100 with some other parts, i might pick them up.

http://vancouver.craigslist.ca/van/pts/5086079737.html
Not sure on the chevy orange LOL...but i haven't seen headers with a thermac stove part.
Homemade??
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post #7 of 13 Old 06-24-2015, 09:44 PM
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Re: Header question

That intake is modified. Someone machined the lower part of the intake to accept a Rochester spread bore like that. A regular Rochester quad would drown a 2.8...
You would have to run one of those Holley Economaster 450 CFM carbs to make stuff work.

The headers look like standard issue early 2.8 S10, but the AIR fittings are a little concerning. Last set I bought with the fittings, the bosses blocked a large area in the tube opening.
I ended having the bosses cut out and the openings welded shut.

If this is $100 for everything, I'd split the cost ($50) and pay you to ship the intake to me.
The headers will work much better than the stock iron manis..

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #8 of 13 Old 06-25-2015, 12:03 AM Thread Starter
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Re: Header question

so the early S10's came with headers? wow news to me.
So are they likely to be 1" inch then? would i be better off buy an aftermarket set?

Max pm me about the intake.
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post #9 of 13 Old 06-25-2015, 03:33 AM
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Re: Header question

I'd bet $$ that those headers are Edelbrocks.

hehehe...

When one of the members here posted about the short supply that Edelbrock had found of the ceramic coated 4x4 sets, I bought 2!

1985 GMC S-15 Gypsy ext cab.
3.4l, Edelbrock intake, a 4.3l throttle body controlled by an '88 TBI ECM. 700R4 with 3.73 rear. Real time tuning using a CF-30 Toughbook with a Moates Ostrich 2 emulator.
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post #10 of 13 Old 06-25-2015, 08:57 AM
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Re: Header question

Quote:
Originally Posted by ReeceB View Post
so the early S10's came with headers? wow news to me.
So are they likely to be 1" inch then? would i be better off buy an aftermarket set?

Max pm me about the intake.
The early S10s came with iron manis. The set of headers in the CL pic look like they are early examples from Edelbrock. They changed the design over the years.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #11 of 13 Old 06-25-2015, 11:07 AM
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Re: Header question

So lookin on summit. It looks like they took that hole off that went to the air breather. Does that effect emissions any?


Sent from AutoGuide.com Free App
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post #12 of 13 Old 06-26-2015, 08:34 AM
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Re: Header question

Quote:
Originally Posted by ReeceB View Post
I haven't seen them myself, i asked the guy how big they are. i'm guessing he measured the ID at the flange. There $100 with some other parts, i might pick them up.

http://vancouver.craigslist.ca/van/pts/5086079737.html
Not sure on the chevy orange LOL...but i haven't seen headers with a thermac stove part.
Homemade??
Reece, I took a closer look at the intake. It's a stock unit that someone opened the plenum and bolted a spreadbore to squarebore adapter plate. Pretty ingenious, although a Rochester spread carb would drown a 2.8.
You would have to run the Holley 450 CFM Economiser (spreadbore)carb to make that work on a 2.8/3.4.
I thought I PMd you but I think I sent it to Damanx by accident. I gotta quit drinking beer...

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #13 of 13 Old 06-26-2015, 08:49 AM
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Re: Header question

Those headers are definitely Edelbrock. Just like the ones on my truck without the O2 bung. That intake is weird! How?

I'd pay $100 for that. I paid more than that for the headers on my truck NOS.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .

Last edited by jimmykicker; 06-26-2015 at 08:52 AM. Reason: ♂9(B╓↨BτM╤z○f5Y5▬♂d╩◙
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