S&S Cycle Compression Release Hole Plug for S&S Performance Cylinder Heads
When building with S&S performance heads that include a compression release port, any unused port must be sealed to prevent compression loss. This plug seals the hole cleanly, keeping your engine airtight without the stock compression release assembly. It is designed for use in S&S performance heads only and must not be installed in OEM cylinder heads.
Key Features
- Seals the compression release port in S&S performance heads when no release assembly is installed
- Maintains correct cylinder compression by closing the port cleanly and securely
- For use in S&S performance heads only – not for OEM cylinder heads
- Made in the USA to S&S Cycle quality standards
Technical Specifications
- Application: S&S performance cylinder heads with compression release port
- Function: Seals unused compression release port
- Restriction: Not for use in OEM cylinder heads
- Origin: Made in USA
Fitment Notes
- For use in S&S performance cylinder heads only
- Not for use in OEM Harley-Davidson cylinder heads – installation in OEM heads is not supported
- Required when building with S&S heads that have a compression release port and no release assembly is being installed
- Verify head compatibility before ordering
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