VALVES
SI manufactures a wide variety of valves, ranging from
economical replacement models to highly sophisticated
competition designs —including titanium. Our categories include the following series:
PORTFLOW
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PORTFLOW
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SILVER LINE INCONEL
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SILVER LINE INCONEL
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SILVER LINE TITANIUM
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SILVER LINE TITANIUM
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CUSTOM VALVE
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CUSTOM VALVE
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SEAT SAVER®This popular new series is designed for rebuilding cylinder heads with minimal seat work. The valve heads are .030" oversized, yet everything else is stock —allowing you to use valve guides of choice. They're available for a wide variety of popular applications. |
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REPLACEMENTThese economical stainless steel valves are suited for stock rebuilds, and ideal for older engines needing to run unleaded gas. They are available with +3 and +15 stems, and many are offered with "Black Knight" coating. For domestic, foreign and motorcycle applications. |
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COMPETITION/PREMIERExcellent flow characteristics —especially at lower lift— and lighter overall weight for higher RPM capabilities make these an superb choice for high performance engines. Attributes include chrome stems, stellite tips and swirl polishing. They're great for improving the flow of stock heads! |
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SILVER LINE STAINLESSDesigned to compare favorably with top-of-the-line offerings from other manufacturers, SI's Silver Line stainless steel valves feature undercut stems for improved flow, swirl polishing, chrome stems and stellite tips. Aftermarket head applications start at .050" longer. Also available with hollow stems. |
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BLACK KNIGHTSI's unique "Black Knight" valves (code: BK) come with a special coating that serves two purposes; to improve heat transfer for increased valve train life, and to combat the problems associated with lower quality unleaded gasoline. Carbon build-up with these valves is almost non-existent. |
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