The Enginetech ST206250 is a 4-pack of intake-side valve seats engineered as a stock replacement for 1999-2009 Buick, Cadillac, Chevrolet, GMC and more engine applications.
Important Notes
- Sold as a 4-pack.
- Application side: Intake 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 | ST206250 |
| Product Type | Valve Seats |
| Quantity per Pack | 4 |
| Inner Diameter | 1.750" |
| Outer Diameter | 2.0695" |
| Thickness | .4200" |
| Seat Angle | 45deg |
| Material | Hi-Chrome Cast |
| Application Side | Intake |
| Country of Origin | United States |
| OEM / Aftermarket Cross References | SB International:SB2062-50 |
Vehicle Fitment
- Years: 1999-2009
- Makes: Buick, Cadillac, Chevrolet, GMC, Isuzu, Saab
- Models: 9-7x, Ascender, Avalanche, Avalanche 1500, Canyon, Colorado, Envoy, Envoy XL, Envoy XUV, Escalade, Express 1500, Express 2500, Express 3500, Rainier, SSR, Savana 1500, Savana 2500, Savana 3500, Sierra 1500, Sierra 1500 Classic, Sierra 2500, Silverado 1500, Silverado 1500 Classic, Silverado 2500, Suburban 1500, 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.
