Cometic Gasket’s Spring Energized MLS Head Gaskets (SEG) are extreme sealing for high-horsepower, forced-induction applications. These gaskets are available for GM LSX and LS applications.
The gaskets have bores available at 4.150” and 4.200”. Jacket construction and spring construction are both Iconel. They offer low bore distortion and low risk for cylinder head wear and extended service life for components.
For more info: https://www.cometic.com/