Description
This listing is for a remanufactured cylinder head designed for GM 6.2 L engines that use casting numbers 821, 823, or 364. The head has been professionally rebuilt to restore proper sealing, compression, and long-term reliability, making it an ideal replacement for a damaged, cracked, or worn original cylinder head.
Casting Number (Important Reference)
Casting Numbers: 821 / 823 / 364
Before purchasing, confirm that your original cylinder head matches one of these casting numbers.
Rebuild Process & Quality
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Complete disassembly and thorough cleaning to remove carbon buildup, oil residue, and old gasket material.
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Pressure testing performed to verify casting integrity and ensure there are no cracks or defects.
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New valve stem seals installed; valve guides replaced as necessary.
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Precision multi-angle valve seat work performed to restore proper sealing and airflow.
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Deck surface machined to a smooth, flat finish for reliable head-gasket sealing.
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Final inspection, measurement, cleaning, and assembly — delivered rebuild-complete and ready for installation.
Key Features
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Remanufactured cylinder head
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Castings: 821 / 823 / 364
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No core charge required
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Resurfaced deck, refreshed valve components, pressure-tested casting
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Built for durability, reliability, and consistent performance
Shipping
Cylinder head ships securely packaged with tracking. Machined surfaces, valve seats, and internal passages are protected during transit.
