The Enginetech ST16871-25 is a 25-pack of exhaust-side valve seats engineered as a stock replacement for 1958-1986 Ford, Mercury engine applications.
Important Notes
- Bulk 25-pack - intended for machine shops or high-volume rebuilders. Individual 4-packs may be available under the base part number.
- Application side: Exhaust valve position - confirm you are replacing the correct side.
- Seat angle: 45deg - confirm head casting matches specified angle before installation.
- Hi-chromium cast construction: standard durable alloy for gasoline applications and general valve-job rebuilds.
Specifications
| Brand | Enginetech |
| Part Number | ST16871-25 |
| Product Type | Valve Seats |
| Quantity per Pack | 25 |
| Inner Diameter | 1.406" |
| Outer Diameter | 1.6925" |
| Thickness | .2500" |
| Seat Angle | 45deg |
| Material | Hi-Chrome Cast |
| Application Side | Exhaust |
| Country of Origin | United States |
Vehicle Fitment
- Years: 1958-1986
- Makes: Ford, Mercury
- Models: 300, Bronco, Brougham, Caliente, Capri, Club, Colony Park, Comet, Commuter, Cougar, Country Cruiser, Country Sedan, Country Squire, Custom, Custom 300, Custom 500, Cyclone, Del Rio Wagon, E-100 Econoline, E-100 Econoline Club Wagon, E-150 Econoline, E-150 Econoline Club Wagon, E-200 Econoline, E-250 Econoline, E-250 Econoline Club Wagon, and more
Valve seats are precision-machined rings press-fit or cast into the cylinder head to form the sealing surface between the valve face and the combustion chamber. Over time, exhaust seats erode from hot combustion gases, suffer impact damage from valve float, or lose geometry from repeated valve-grinding operations - any of which leads to lost compression, burnt valves, and rough idle. Installing new valve seats during a head rebuild restores correct seat angle, sealing pressure, and thermal contact between the valve and the cylinder head.
WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or reproductive harm, including lead and nickel.
