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Multi Layer Aluminum Exhaust Gasket Built for Ford 4.6L and 5.4L 3V Round Port Mustang GT Applications
The PY-8023-A-AL is a multi layer aluminum exhaust header gasket designed for Ford 4.6L and 5.4L three valve round port engines found in 2005 to 2010 Mustang GT applications. Aluminum multi layer gaskets provide a different performance characteristic than steel MLS units, with the aluminum layers offering excellent conformability to minor surface irregularities at the cylinder head mating surface, combined with the multi layer construction's advantage of maintaining sealing load through thermal cycles. For the 4.6L and 5.4L 3V engines in the S197 Mustang generation, this is the correct gasket specification when installing aftermarket headers that require a fresh sealing solution.
The round port configuration of the 4.6L and 5.4L 3V cylinder head is matched precisely by the PY-8023-A-AL port opening shape, ensuring that the full exhaust port area is available and the gasket seats properly without overhang or misalignment. Correct port match is essential for both sealing and flow on a performance exhaust installation. Using this gasket with Kooks Ford 4.6L and 5.4L Mustang headers provides the correct material and geometry combination for a professional quality installation on a first generation S197 Mustang platform.
Key Features
- Multi layer aluminum gasket construction for excellent surface conformability
- Round port opening matches Ford 4.6L and 5.4L 3V cylinder head geometry
- Designed for 2005 to 2010 Mustang GT with 4.6L and 5.4L 3V engines
- Precision stamped for correct port and bolt hole alignment
- No gasket sealant required
- Compatible with Kooks Ford Mustang header applications on these engines
What's Included
- this gasket multi layer aluminum exhaust gasket set for Ford 4.6L and 5.4L 3V round port (quantity as required for application)
Specifications
| Specification | Detail |
|---|---|
| Part Number (MPN) | PY-8023-A-AL |
| UPC | Contact us for UPC |
| Gasket Type | Multi Layer Aluminum (MLA) |
| Port Shape | Round |
| Application | Ford 4.6L 3V, 5.4L 3V Round Port |
| Fitment | 2005 to 2010 Ford Mustang GT |
| Use With | Kooks Ford Mustang Header Applications |
Frequently Asked Questions
What vehicles does this gasket fit?
This gasket is designed for 2005 to 2010 Ford Mustang GT models equipped with the 4.6L 3V or 5.4L 3V engine using the round port cylinder head configuration.
What does multi layer aluminum mean compared to multi layer steel?
Multi layer aluminum gaskets use aluminum layers instead of steel layers. Aluminum conforms more easily to minor surface irregularities, which can be beneficial on older cylinder head surfaces. Steel MLS gaskets offer greater temperature resistance and are typically preferred for very high heat applications.
Can I reuse this gasket after removing the header?
No. Like all multi layer gaskets, this gasket should be replaced any time the header is removed from the cylinder head. The layers take a set during initial installation and may not seal reliably after reinstallation.
Do I need sealant with this gasket?
No. This gasket is designed to seal without additional sealant. Applying sealant to a multi layer gasket is not recommended.
Does this gasket fit both the 4.6L and 5.4L 3V engines?
Yes. The round port opening and bolt pattern on this gasket are compatible with both the 4.6L and 5.4L 3V versions of the Ford Mustang application in the 2005 to 2010 model year range.
Will this gasket work with the Shelby GT500?
The Shelby GT500 in this era uses a different engine configuration. See the PY-8034-AL for the 5.4L and 5.8L 4V GT500 application.
What torque should I use with this gasket?
Use the torque specification provided in your Kooks header installation instructions for the applicable Mustang application.
Is this gasket the same as what Kooks uses in their header kits?
Yes. This gasket is the same gasket specification used in Kooks Ford Mustang GT header kits for this application, available here as a replacement or standalone part.
How many gaskets are included in the set?
Contact us to confirm the exact quantity. A complete V8 application requires gaskets for all eight exhaust ports.
Does proper cylinder head surface finish matter for these gaskets?
Yes. The cylinder head exhaust port sealing surface should be clean and free of old gasket material, deep scratches, or warping for optimal gasket performance. The aluminum layers can accommodate minor surface variation, but gross surface damage will prevent a proper seal.
Installation Instructions
- Clean the 4.6L or 5.4L 3V cylinder head exhaust port face completely, removing all old gasket material and debris.
- Do not apply gasket sealer to this gasket or the mating surfaces.
- Position each gasket over the exhaust port, aligning the round port opening with the cylinder head port.
- Bring the header flange against the cylinder head with the gasket in place and thread all bolts by hand.
- Torque bolts in a crossing pattern to the specification in your Kooks header installation instructions.
- Re torque after the first heat cycle to ensure proper gasket seating.
Prop 65 Warning
WARNING: This product can expose you to chemicals known to the State of California to cause cancer, birth defects or reproductive harm. For more information go to www.P65Warnings.ca.gov.
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