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Ultra-Seal material provides a positive seal through controlled swelling of the gasket once exposed to hot engine oil.
The polymers used in Ultra-20 also insure gaskets will not harden and fall apart like others can. Gaskets are coated with an easy release material which helps prevent tearing when the valve covers are removed.
| Make | Model | Years |
| Chevrolet | Corvette | 1960 - 1986 |