The Enginetech ST15621PM-25 is a 25-pack of powdered metal valve seats engineered as a stock replacement for 1960-2014 AM General, Buick, Cadillac, Chevrolet and more 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.
- Universal intake/exhaust fitment: this seat is specified for both valve positions on supported engines.
- Seat angle: 45deg - confirm head casting matches specified angle before installation.
- Powdered-metal construction: high-density sintered alloy for performance, high-load, and high-RPM use.
- With 1.500 - 1.530 valve head diameter.
- LPG.
- Frequently purchased with: ST15621PM.
Specifications
| Brand | Enginetech |
| Part Number | ST15621PM-25 |
| Product Type | Powdered Metal Valve Seats |
| Quantity per Pack | 25 |
| Inner Diameter | 1.3125" |
| Outer Diameter | 1.5642" |
| Thickness | .2188" |
| Seat Angle | 45deg |
| Material | Powdered Metal |
| Application Side | Intake/Exhaust |
| Country of Origin | United States |
Vehicle Fitment
- Years: 1960-2014
- Makes: AM General, Buick, Cadillac, Chevrolet, Ford, GMC, Lincoln, Mazda, Mercury, Oldsmobile, Pontiac
- Models: 1000 Series, 1500 Series, 2500 Series, 300, 3000, 3500, 60 Special, 6000, 98, Aerostar, Allante, Astre, Astro, B2300, Bel Air, Biscayne, Blazer, Bobcat, Bonneville, Bravada, Bronco, Brookwood, Brougham, C10, C10 Pickup, 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.
