Standard Engine Seat Ring General Motors GM 12350996 Engine Valve Seat

Product Specification

This OEM-specified valve seat (part #12350996) delivers factory-grade performance for GM engine repairs and rebuilds. Designed to meet exact General Motors engineering standards, it ensures reliable valve operation and combustion efficiency in modern gasoline and flex-fuel applications.

✔ Key Features & Benefits

1. OEM-Identical Specifications

• Manufactured to GM's original blueprint dimensions (part #12350996)

• Precision-machined to maintain exact valve positioning and alignment

• Guaranteed compatibility with specified GM engine models without modification

2. Advanced Material Composition

• Special high-chromium alloy steel formulation resists extreme heat

• Heat-treated surface (38-42 HRC) prevents premature valve recession

• Optimized thermal conductivity protects against warping and distortion

3. Enhanced Engine Performance

• Maintains proper compression ratios for maximum power output

• Creates perfect valve-to-seat seal for efficient combustion

• Reduces valve train wear by providing stable valve guidance

• Improves fuel efficiency through consistent sealing performance

✔ When Replacement Becomes Necessary

1. Visible Wear Indicators

• Noticeable pitting, cracking, or erosion on existing seats

• Valve seat recession causing excessive valve clearance

• Uneven wear patterns affecting valve sealing

2. Performance Symptoms

• Compression loss between cylinders (verified by leak-down test)

• Reduced engine power and acceleration

• Increased oil consumption from poor valve sealing

• Overheating issues related to improper heat transfer

✔ Technical Superiority

1. Precision Manufacturing

• CNC-machined to tolerances within ±0.0005"

• Consistent surface finish (16-32 μin Ra) for optimal sealing

• Special contouring matches OEM valve seat profiles

2. Durability Features

• Withstands continuous operating temps up to 1,200°F (650°C)

• Resists micro-welding and material transfer from valves

• Maintains dimensional stability through thermal cycles

✔ Professional Installation Requirements

1. Machining Specifications

• Requires proper counterbore preparation with correct angles

• Needs precise interference fit (0.003-0.005") for secure installation

• Demands professional-grade seat installation tools

2. Complementary Services

• Valve face should be cut to match seat angle (typically 45°)

• Recommended to replace guides when installing new seats

• Essential to perform proper run-in procedure after installation

Compatible Applications:

• GM LS-series and EcoTec3 engines

• GM truck and SUV V6/V8 applications

• Performance builds requiring OEM-quality components

• Fleet vehicle maintenance and repairs

Why This Valve Seat Stands Out:

1. Long-Term Reliability - Engineered to last the life of the engine when properly installed

2. Consistent Performance - Maintains stable valve operation through all RPM ranges

3. Thermal Management - Effectively transfers heat from valves to cylinder heads

4. Fuel Compatibility - Works perfectly with both gasoline and ethanol blends

Package Contents:

• (1) Genuine-quality valve seat (OEM #12350996)

• Protective anti-corrosion packaging

• Detailed installation specifications

Important Considerations:

• Always verify specific engine application before purchase

• Professional installation strongly recommended

• Ideal to replace all seats during cylinder head service

• Requires proper break-in procedure for maximum longevity

This premium valve seat solution restores your GM engine to factory performance standards, providing the durability and precision expected from original equipment components. Whether you're maintaining a daily driver or building a high-performance engine, this OEM-spec part delivers reliable operation under all driving conditions.

With over 30 years of expertise in automotive parts export, we specialize in manufacturing high-precision, high-performance components for global markets. Our products meet stringent quality standards and are trusted by clients worldwide.

• Equipped with advanced testing machinery for material analysis and heat treatment verification.
• Dedicated engineering and QC teams ensure every product meets your exact specifications and performance requirements.

• Custom solutions available based on your samples or technical drawings.
• Trial orders (small quantities accepted) to facilitate smooth collaboration and build long-term partnerships.