* PCV Valve: This valve is usually located on the valve cover. Its exact position will vary slightly depending on the specific engine (e.g., 326, 400, etc.).
* Hose(s): Hoses connect the PCV valve to the intake manifold (often near the carburetor) and possibly to other parts of the crankcase ventilation system.
* Breather(s): These can be on the valve cover(s) as well and are part of the overall crankcase ventilation system, though not directly part of the PCV circuit itself.
To pinpoint the exact location of the PCV valve and related components, you'll need to either:
1. Consult a 1968 Pontiac Firebird repair manual: This will have diagrams showing the exact location of all the parts for your specific engine.
2. Look at a diagram online: Search for "1968 Pontiac Firebird [engine size] PCV system diagram" (replacing "[engine size]" with your engine's displacement, e.g., 326, 400, etc.)
Without knowing the specific engine in your Firebird, I can't give you a more precise location.
