Supertech Black Nitride Dished Valve Set for H22A/H23A VTEC

Supertech Black Nitride Dished Valve Set for H22A and H23A VTEC

This product is a matched set of intake and exhaust valves for Honda H series VTEC cylinder heads. In the valvetrain system, these valves seal the combustion chamber and control cylinder filling and exhaust evacuation. Valve head diameter, stem diameter, overall length, and keeper groove style determine fit in the guide, seat, retainer, and spring package. This set is configured as standard size dished valves, intended as a direct geometry match to the standard diameter H22A specification while using a dished valve head profile.

Compared with typical factory valves, the primary documented change here is the use of a Black Nitride surface treatment. Black Nitride is described by the manufacturer as a hard, low friction surface treatment intended to promote smoother motion and wear resistance at the stem and guide interface, with a surface finish stated to be smoother than chrome coated stems. Supertech also notes process steps that include heat treatment and a nitride hardening treatment for applicable valves.

An experienced builder or installer typically selects this type of valve set when refreshing a high mileage head, replacing damaged valves, or assembling an engine intended for higher thermal and mechanical demand than stock. Because these are standard size valves, this set is selected when the cylinder head is being kept at standard valve diameters rather than moving to oversize valves. The dished head configuration is selected when matching an existing combination that uses dished valves.

Key Features

• Application: Honda H22A 2.2 liter VTEC and JDM H23A VTEC cylinder heads
• Set contents: 8 intake valves and 8 exhaust valves
• Intake valve geometry: 35.00 mm head diameter, 5.48 mm stem diameter, 106.85 mm length, dished head, single groove
• Exhaust valve geometry: 30.00 mm head diameter, 5.45 mm stem diameter, 106.45 mm length, dished head, single groove
• Surface treatment: Black Nitride

Considerations

• Machine work: Valve jobs and seat condition should be evaluated during installation. Seat contact and valve sealing should be confirmed during assembly.
• Guide fit: The manufacturer advises measuring guide inner diameter and setting stem to guide clearance appropriately for the materials used.
• Parts matching: Verify installed spring height, retainer and keeper compatibility with a single groove valve, and confirm valve stem seal fit for the stem diameters listed.