Is this a stock 1g O2 housing?

[DaOnE51T]

I was wondering if this is a stock 1g O2 housing? It has a number on the side of it #674 2". I don't know what that means. Here is a couple of pictures of it. THANKS

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[oldman]

I'm not sure about the number but looks like it's a 1g because 2g o2 has a different location for the o2 sensor.

 

[DaOnE51T]

ANy other guesses? THANKS

 

[92awddsm]

Like oldman said, it is a 1g o2 housing. A 2g has the o2 mounted closer to the front. And it is a stock casting, might be ported but none of us can tell without looking inside.

 

[DaOnE51T]

THANKS for your help