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Where Is the Orifice located in a 1998 Chevy S10 Blazer with 4.3 V6?

There's no single "orifice" in a 1998 Chevy S10 Blazer 4.3L V6 that's universally referenced. The term "orifice" is too general. You need to be more specific about what orifice you're looking for.

To help me help you, please specify what system or component you're referring to. For example, are you looking for:

* An orifice in the fuel system? There might be small orifices within fuel injectors or in the fuel pressure regulator.

* An orifice in the PCV system? The positive crankcase ventilation system might have small passages that could be considered orifices.

* An orifice in a vacuum line? Restrictive points in vacuum lines could be described as orifices, although they're usually just smaller diameter sections of tubing.

* Something else entirely?

Give me more context, and I can provide a more accurate answer.