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CBA CBA is offline
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SSI Headers 1983 3.0 motor. Exact Model to buy

Anybody have the exact part number of SSI Header to buy for stock 3.0 1983 motor. I've seen thick and thin flange. Seems to be a variety of ones to buy and want to make sure I get the right see.

Thanks,
Old 12-04-2018, 07:45 PM
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Just grabbed some new ones last week for my 83 3.0

You need thin flange with this Part Number: 91.911SSi
Old 12-04-2018, 07:49 PM
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Quote:
Originally Posted by dg567 View Post
Just grabbed some new ones last week for my 83 3.0

You need thin flange with this Part Number: 91.911SSi
Thank you.
Old 12-04-2018, 08:01 PM
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Hmmm....

My engine is also an '83, and I had to stack washers and spacers in order to install thin flange SSIs.
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Old 12-04-2018, 08:01 PM
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Hhmmm the plot thickens..... or so do maybe the flanges.

I think there my have been a design change mid year on the motor?
Old 12-04-2018, 08:07 PM
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I did install washers but only on the barrel nuts - I believe it was 3 washers and my motor has the shorter studs installed.
Old 12-04-2018, 08:16 PM
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Unless the studs were changed to the short ones, 80-83 SCs were thick flange. Also need a set with an oxy sensor bung, if you're using one.
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Old 12-04-2018, 08:20 PM
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ok - mine must have been changed by a PO etc. I was simply replacing what was there.
Old 12-04-2018, 08:52 PM
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Quote:
Originally Posted by john walker's workshop View Post
80-83 SCs were thick flange. Also need a set with an oxy sensor bung, if you're using one.

Yes on US delivered SCs and any ROW SCs fitted with catalytic converters. Other ROW delivered '80 -'83 SCs with no catalytic converters fitted ( e.g. UK delivered cars) remained thin flange.



Mark
Old 12-05-2018, 03:06 AM
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Thank you guys. Appreciate it.
Old 12-05-2018, 08:19 AM
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Quote:
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Yes on US delivered SCs and any ROW SCs fitted with catalytic converters. Other ROW delivered '80 -'83 SCs with no catalytic converters fitted ( e.g. UK delivered cars) remained thin flange.



Mark
makes sense as my car is a euro 83 3.0 engine
Old 12-05-2018, 10:58 AM
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US thick...ROW thin...I have SSI's on an 83 ROW and they are thin flange.
BTW, you can easily put a bung in any of them...I did this on my ROW for an AFR gauge. I found a bung on an a exhaust strap that wraps around and tightens up...you just drill an appropriate size hole....no leaks...could weld one on but why?
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Old 12-05-2018, 11:50 AM
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I have a 1980 ROW with a cat installed and ordered 91-915-SSI-INT Did I buy the right one?
Old 12-05-2018, 04:37 PM
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My USA model 1983 has Thick flange SSI's
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Old 12-06-2018, 08:20 AM
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Have you considered having a peek under the car? Thin and thick flange are REALLY easy to tell apart.
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Old 12-06-2018, 09:40 AM
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I’ve read many posts about thick vs thin flange, but nobody discussing the bung or oxygen sensor hole. Can somebody describe in detail what it’s for? Is there a tube or engine hose that hooks up to it? Is it needed to pass smog?

Regards!
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Old 12-06-2018, 03:04 PM
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Quote:
Originally Posted by Frog76S View Post
I’ve read many posts about thick vs thin flange, but nobody discussing the bung or oxygen sensor hole. Can somebody describe in detail what it’s for? Is there a tube or engine hose that hooks up to it? Is it needed to pass smog?

Regards!
Do a search for “911sc lambda”

More info than I could post. Long story short it’s pretty much a non issue as far as SSI model choice, if you have the bung and don’t need it you can plug it, if you need it and don’t have it you can add it.
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Old 12-06-2018, 04:51 PM
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Oxygen sensor "bung" is essentially a hole drilled in the tubing with a nut welded on, generally near the collector (where 3 pipes merge into one) on the left hand heat exchanger, so the O2 sensor can screw in. It measures the burned gasses and sends a signal to the little box under the passenger seat, which adjusts the mixture to keep the engine running clean at idle.

911s after 1980 had them from the factory, if you intend on keeping the stock fuel injection system, you want the bung, although you will probably have to modify the stock sensor to make the wire longer, the factory one is pretty short and may not reach the new location of the bung.

Here is mine, it came without the bung, I had it added. If you are buying new, buy the one you need, assuming stock it is probably thick flange with the O2 bung (but crawl under and take a look to confirm). If buying used, it is pretty easy to add, any muffler shop should be able to do it easily provided they have a TIG welder for stainless.

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Old 12-07-2018, 05:43 AM
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Quote:
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Have you considered having a peek under the car? Thin and thick flange are REALLY easy to tell apart.
This is fair. My question prob sounds silly but the car is not with me.
Old 12-07-2018, 05:59 AM
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Quote:
Originally Posted by Clark Griswold View Post
This is fair. My question prob sounds silly but the car is not with me.
i would never order such a major piece without getting eyes on what i am trying to do first.
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Old 12-07-2018, 06:47 AM
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