OEM F4TZ-6A665-A vs SWF-6A665A

Which 7.3 Powerstroke CCV Upgrade Is Actually Worth It?

If you own a 1994–2003 Ford 7.3L Powerstroke, you already know the crankcase ventilation (CCV) system is a commonly overlooked maintenance item. Oil mist, blow-by, and clogged breathers can lead to performance loss & oil leaks leaving your engine bay a mess.

Two of the most talked-about solutions are:

• OEM Ford F4TZ-6A665-A
• SWF-6A665 (SWAG Performance Parts)

Let’s break down exactly how they compare—and which one is the smarter long-term upgrade.

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What Is F4TZ-6A665-A?

The F4TZ-6A665-A is the factory crankcase vent valve / CCV breather assembly used on 7.3 Powerstroke engines.

Key Details:

• Genuine Ford OEM part
• Direct replacement for stock CCV system
• Designed for 1994–2003 7.3L Powerstroke
• Often referred to as the “doghouse breather”

Pros:

✔ Perfect factory fit
✔ Maintains OEM emissions configuration
✔ Backed by Ford engineering and warranty

Cons:

❌ Expensive (often around $300+)
❌ Still allows oil mist recirculation
❌ Known to clog over time
❌ Not cleanable

Bottom line: OEM restores stock function—but doesn’t improve it.

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What Is SWF-6A665A (SWAG Performance Parts)?

The SWF-6A665A is an upgraded CCV reroute / breather solution designed specifically to fix the OEM system’s biggest flaws.

Key Advantages:

• Cleanable / Replaceable Internal Filter
• Reduces / Eliminates oil contamination in intake piping
• Reduces turbo and intercooler buildup
• Helps maintain cleaner combustion

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OEM vs SWAG: Side-by-Side Comparison

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Performance Difference (Real-World)

With OEM F4TZ-6A665-A:

• Oil residue builds up in:
  • Intake tubing
  • Intercooler
  • Turbo compressor housing
• Gradual performance loss over time

With SWF-6A665A:

• Cleaner intake system
• Reduced carbon/oil sludge buildup
• More consistent airflow and turbo efficiency

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Which One Should You Choose?

Choose OEM F4TZ-6A665-A if:

• You want factory-correct restoration
• You’re keeping the truck 100% stock
• Emissions compliance is your top priority

Choose SWF-6A665A if:

• You want better performance and reliability
• You’re tired of oil buildup in your intake
• You want a true fix—not just a replacement

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Final Verdict

The OEM F4TZ-6A665-A does exactly what it was designed to do—replace a worn factory part.

But the SWF-6A665A goes further. It solves the root problem of the 7.3 Powerstroke CCV system.

The SWF-6A665A from SWAG Performance Parts was engineered to be a smarter alternative to the increasingly expensive OEM F4TZ-6A665-A, giving 7.3 Powerstroke owners a cost-effective solution without sacrificing performance. As OEM prices continue to skyrocket, this upgrade delivers better long-term value by incorporating a cleanable, reusable filter design, eliminating the need for repeated replacements like the stock unit. Instead of throwing away clogged factory breathers, users can simply service the filter—saving money over time while maintaining optimal crankcase ventilation and cleaner engine operation.

? If you're upgrading your truck—not just maintaining it—the SWAG Performance Parts SWF-6A665A is the clear winner.