bacon310
Registered Member
Im currently in the search for aftermarket headers for my stock 350 tbi engine. Problem is I cant find any that have the inlet for the 02 sensor. Everything ive seen on summit and jeggs do not have the provisions for it.
CK5
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Aftermarket Headers
- Thread starter bacon310
- Start date
thearborbarber
1/2 ton status
I welded a 02 sensor bung on the ones I've bought. It's real easy with a step drill and small welder.
rampage
3/4 ton status
Problem is, welding it on yourself doesn't make it CARB legal.
Very quick search, only found these: https://www.summitracing.com/parts/jba-1830s-5jt/overview/year/1988/make/chevrolet/model/blazer
They are EO approved. And not cheap because of it. Don't let people tell you that increasing regulation doesn't increase cost to the consumer.
most O2 sensors, on a TBI engine, are located in the Y-pipe. I am going with 3" single exhaust system in my TBI 350 truck. Also, a set of mid-length headers with an aftermarket scavenger Y-pipe. I am going to locate the O2 sensor in the scavenger Y-pipe in a similar way it came factory.
Flowtech Mid-Length Headers PN# 11508
Flowmastster Scavenger Y-Pipe PN# Y250300
Flowtech Mid-Length Headers PN# 11508
Flowmastster Scavenger Y-Pipe PN# Y250300
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Those are some pricey headers. The ones I am going to get are only about $165
But do they have a CARB EO? That is the rub. Edelbrock's old TES headers had AIR fittings, and I'd be surprised if you can buy a header that has those anymore. Apparently Edelbrock is out of the header business though, that was the first place I looked.
Anyone else in any state with half a brain (edit: the states brain, not the individual.
)could weld in an O2 bung (or M18x1.5 jam nut IIRC) but in CA, to remain legal, they've got to have a CARB EO.
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I bought my set for my 90 350 TBI engine from Edelbrock and they come with out the air as did the engine. The set i had with my 85 came with Air and a bung in the crossover, which I plugged as it was Federal and not Calif equipped for Smog. You are right they cannot be found, been off the market for the last 4 years.
thearborbarber
1/2 ton status
That's a huge drag.
RubberFloorMat
1/2 ton status
most headers are CARB legal, the o2 sensor doesnt go in the header anyway. Doug Thorely, JBA and a couple others have CARB numbers.
RubberFloorMat
1/2 ton status
bacon310
Registered Member
Well either way I ordered some flowtech headers, I think im just going to weld the bung onto the exhaust, where should I weld it since im running straight pipes? Also I cant seem to find the connector for the O2 sensor anyone have a picture of where its supposed to be? Ive done a google search and haven't found a clear image or definite answer as to where its actually located. Has anyone done a 1 wire to 3 wire heated swap?
the collector is correct placement . this = swap to heated 3 wire to function correctly that far down the line.as the factory manifold drive side was oem position for sensor .
yes there is write ups on this . dont recall thread off top of my head for here at ck5 .
and factory single wire is a weather pack style plug purple wire off the main harnness on the firewall driver side by the steering column.
yes there is write ups on this . dont recall thread off top of my head for here at ck5 .
and factory single wire is a weather pack style plug purple wire off the main harnness on the firewall driver side by the steering column.
AFS-74 is the heated Delco O2 you want to use.
bacon310
Registered Member
Ok so putting the o2 sensor in the collector would mean swapping the 1 wire for a 3 wire like I wanted to do. Does it matter what side I put it on ? Im sure with enough digging I can find the thread on here. Thanks for the help.
bacon310
Registered Member
this would be the one to use for the 3 wire instead of the 1 wire?
Correct. Side doesn't matter, but will be easier whatever side the O2 is already on. AFS-74 uses a three position weatherpack connector, stock is a single weatherpack. Taking the existing O2 wire out of the single weatherpack (truck side of the connection) and putting it into a three wire connector is easy. Add power and ground wires, done.
bacon310
Registered Member
cool, I was doing some reading and I actually found a diagram, hand drawn but pretty clear and its exactly what you just stated. Now I just have to find the original wire for the oxygen sensor on my truck. I cant seem to find it. Thanks for the help, I definitely have some work to do this weekend.
I need to get one of those for when I do my exhaust system. I want to install it into the Y-pipe, so the O2 sensor will read both sides of the exhaust system. There is a possibility I may have to move the Y-pipe back further away from the headers than the stock position, and it will need a 3-wire heated O2 sensor.
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The O2 connector on my TBI truck is located in the wire harness that runs down the left side of the transmission, but my truck has a 4L80E trans, so it could be different from yours.
