LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Best pre cat O2 sensors?

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Old 10-10-2015, 06:54 PM
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Default Best pre cat O2 sensors?

Wondering what o2 sensors I should go with for my 96 z28. They are screwing into my mac mid length headers this winter. I am getting the after cat o2's tuned out. A/C delco's are expensive, is there an equivalent quality cheaper option?
Old 10-10-2015, 07:42 PM
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You can get them off amazon for pretty dang cheap. Part# AF75. They were $27 each. That is a gm part so they are legit, not a cheap knockoff.
Old 10-10-2015, 09:53 PM
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^^^^^this

Get the AC Delco on Amazon
Old 10-10-2015, 11:48 PM
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AC............Delco.

KW
Old 10-11-2015, 08:44 AM
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+ another vote for ACDelco O2s. If your MAC's are coated use your old O2 sensors for the first few drives until the coating inside the tubes cures. I've read the gasses it gives off will damage the sensors, no sense ruining your brand new ones.
Old 10-11-2015, 08:55 AM
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Thanks for the info. Will do with using the old ones until headers cure. Never would have thought of that.
Old 10-11-2015, 08:58 AM
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How about o2 extensions?
Old 10-11-2015, 09:14 AM
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Originally Posted by 350 groundpounder
How about o2 extensions?
You shouldn't need extensions with mid length headers, I didn't with my SLPs and they're supposed to be one of the longer mids.
Old 10-12-2015, 08:55 AM
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When you buy a delco nowadays you're getting a reboxed denso. Never had problems with either.
Old 10-12-2015, 09:26 AM
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You should check with Sam Taylor Buick before buying off Amazon.
Old 10-17-2015, 09:34 PM
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AC delco



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