What Valve Seals Do
Valve stem seals:
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Control oil flow to valve guides
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Prevent oil from entering cylinders
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Reduce smoke at startup
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Maintain proper combustion efficiency
When worn, you may see:
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Blue smoke on cold start
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Oil consumption increase
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Fouled spark plugs
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Rough idle
Small seals, big impact.
Enhance your Mitsubishi 4G63 DOHC engine’s performance with Street Sport Industries set of 16 valve stem seals, designed to fit and be compatible with Mitsubishi Eclipse, Lancer Evolution, and Eagle Talon models equipped with the 4G63 engine.
Key Features
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Designed for DOHC 4G63 cylinder heads
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Compatible with turbo and NA setups
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High-temperature resistant materials
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Direct-fit replacement
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Ideal during head rebuild or cam upgrade
Translation: clean burn, proper oil control.c
These high-quality seals are engineered for 6.6 mm valves (OEM size) and are suitable for both turbo and non-turbo variants. Crafted from durable FKM material, they offer exceptional resistance to high temperatures and oil, ensuring a reliable seal that prevents oil leakage into the combustion chamber. Ideal for engine maintenance or performance upgrades, this set helps maintain optimal engine efficiency and longevity in your vehicle.
Installation Notes
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Remove valves carefully
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Inspect valve guides
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Use proper seal installation tool
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Replace as full set
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Verify valve spring condition
Because replacing just one seal? Not worth it.
Final Verdict
The Valve Seals for Mitsubishi 4G63 DOHC are a critical maintenance component during any top-end rebuild. Proper oil control, reduced smoke, and improved engine efficiency.
Because a healthy 4G63 should spool—not smoke.
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