The Enginetech EM1863 exhaust valve features a 1.299" head diameter, 0.3161" stem (8mm nominal), and 4.213" overall length with a chrome-plated stem. Fits 1971-1984 Mazda/Ford 1.6L/1.8L/2.0L applications.
Important Notes
- Sold individually as a single valve. Order the quantity required for your engine configuration (typically one per cylinder per valve position).
- Chrome-plated stem provides a hard, low-friction wear surface for extended service life.
- Always verify head diameter, stem diameter, overall valve length, and groove count against the OE valve being replaced before installation - valve dimensions vary across engine families and a visual match alone is not sufficient.
Specifications
| Part Number | EM1863 |
| Valve Type | Exhaust Valve |
| Head Diameter | 1.299" |
| Stem Diameter | 0.3161" (8mm nominal) |
| Valve Length | 4.213" OAL |
| Stem Finish | Chrome Stem |
| Number of Grooves | 1 |
| Weight | 0.25 lbs |
| OEM Cross-Refs | AC Clevite: 262265, Beck Arnley: 0212464, Beck Arnley: 021-2464, DNJ Rock: EV402, Dynagear: AX1863, Elgin: E1863 |
Vehicle Fitment
- 1971-1972 Mazda 1.6L / 1586 SOHC L4 8V NA 78.00mm Bore
- 1979-1982 Mazda 2.0L / 1970 SOHC L4 8V MA 80.00mm Bore
- 1972-1978 Ford 1.8L / 1796 SOHC L4 8V "A" Mazda 78.00mm Bore
- 1979-1982 Ford 2.0L / 1970 SOHC L4 8V "1" Mazda 80.00mm Bore
- 1972-1976 Mazda 1.6L / 1586 SOHC L4 8V NAV 78.00mm Bore
- 1977-1978 Mazda 1.8L / 1796 SOHC L4 8V VB 78.00mm Bore
- 1979-1984 Mazda 2.0L / 1970 SOHC L4 8V MA 80.00mm Bore
Product Video
Watch the Enginetech exhaust valve overview: https://youtu.be/G487Dw8HtII
Watch the Enginetech exhaust valve overview: https://youtu.be/eLaQHop7rH8
Enginetech standard valves are stock-replacement engine valves produced from OE grade materials or better, engineered with the production engine rebuilder in mind. Face runout, stem finish, and stem diameter tolerances are held to some of the tightest standards in the internal engine parts industry, and every valve is inspected by on-site engineers against a documented quality plan before it leaves the plant. The line covers domestic, import, and common high-performance applications across a full range of head diameters, stem diameters, and overall lengths, with chrome-plated and nitride-hardened stem finishes available where the engine's operating conditions call for the upgrade. Always verify head diameter, stem diameter, valve length, groove count, and any oversize stem requirement against the original valve being replaced before installing, as multiple valve configurations can share the same vehicle nameplate.
WARNING: This product can expose you to chemicals including lead and nickel, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
