• Hard chrome plated stems to reduce friction and stem/guide wear.
• Seat-face accuracy and concentricity for dependable sealing.
• Swirl-polished heads for stable flow characteristics.
• Hardened tips to extend follower and lash component life.
• OE diameter and oversize options available by application.

Base Alloy

Performance-grade stainless (e.g., EV8/21-4N) selected for hot hardness and durability in exhaust service.

Hard Chrome Stem Plating

Provides a low-friction, wear-resistant surface to help maintain clearances and reduce scuffing in the guide.

Surface Details

• Swirl-polish on the head to smooth boundary layer.
• Controlled stem finish for consistent fit.
• Precision-ground seat faces for repeatable sealing.

Geometry

• Flat, dished, and tulip head shapes by application.
• Undercut or straight stems as validated.

Sizes

• OE diameter for stock ports and chambers.
• Oversize options for ported heads where supported.

Compatibility

• Match with Supertech springs and retainers for your cam profile.
• Works with performance guides and seat materials.

Street / NA

Chrome stem plating supports smooth operation and long service life in daily-driven and naturally aspirated builds.

Light Track / Moderate Heat

Suitable for performance street and occasional track duty. For sustained high EGT or endurance use, consider Inconel exhaust valves.

• Measure guide ID and set stem-to-guide clearance per material and finish.
• Cut seats to the correct angles and contact width; verify concentricity.
• Check installed height, seat pressure, coil bind, and retainer-to-seal clearance.
• Verify piston-to-valve clearance at intended lift and timing.
• Use lubrication appropriate for chrome stems during assembly.

Chrome vs. Black Nitride?

Both aim to reduce friction and wear. Chrome is a hard plating typically used on stems; Black Nitride is a diffusion layer often applied over stainless. Choice depends on your use case and component compatibility.

Does chrome affect clearances?

Stem finish and thickness should be accounted for during machining. Always measure and set guide clearance to the recommended spec.

Is re-plating possible?

Consult your machine shop and Supertech support. Do not alter stem dimensions or seat geometry without guidance.

Do I need upgraded springs?

Use springs matched to your cam and valve mass. Proper seat and open pressures are essential for valve control at RPM.