Used 806 Cylinder Head #025
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Used GM LS 806 Cylinder Head, Cathedral Port
This is a used OEM-style GM LS 806 cylinder head. The 806 casting is an early cathedral port LS cylinder head commonly associated with LS1 and early Gen III LS-based engines.
806 heads are a factory LS cathedral port head often used for stock replacement, repair work and early LS1-style builds. They are not as sought after as later 243 or 799 heads, but they are still a useful OEM GM casting for many LS applications where the early head design is required.
One important difference with 806 heads is the early perimeter bolt valve cover design. These heads do not use the later center bolt LS valve covers, so make sure you have the correct valve covers, coil bracket setup and related parts for this style of cylinder head.
Important Condition Information
This is a used cylinder head and condition may vary between individual units. Some heads may be more complete, while others may be missing valves, springs, retainers, seals, bolts, plugs or other small parts.
Some used heads may have cosmetic wear, dirt, oxidation, gasket residue, broken bolts, damaged threads or other defects. Please see the product pictures carefully for actual condition and included parts.
Important Fitment Information
This 806 cylinder head is intended for GM LS cathedral port applications. It is commonly associated with early LS1-style Gen III LS engines, but may also be used in other LS-based combinations where the chamber size, valve size, valve cover style and cathedral port layout are suitable.
Always compare the casting number, port shape, combustion chamber style, valve size, valve cover bolt pattern and cylinder head bolt pattern with your original cylinder head before ordering.
Suitable For
- GM LS 806 cathedral port cylinder head applications
- Early LS1-style Gen III LS-based engines
- 5.7L LS1-style stock replacement and rebuilds
- Budget LS engine repairs and mild performance builds
- Applications using early perimeter bolt LS valve covers
- LS combinations where a factory cathedral port head is required
Product Details
- Condition: Used
- Casting number: 806
- Type: LS cathedral port cylinder head
- Application: GM LS-based engines with cathedral port cylinder heads
- Common engine applications: Early LS1-style Gen III LS engines
- Valve cover style: Early perimeter bolt valve covers
- Combustion chamber: Approx. 67cc
- Intake port volume: Approx. 200cc
- Exhaust port volume: Approx. 70cc
- Intake valve size: 2.00 inch
- Exhaust valve size: 1.55 inch
- Quantity: Sold each
Typical Stock Flow Numbers
| Valve Lift | Intake Flow | Exhaust Flow |
|---|---|---|
| .100" | 67 cfm | 52 cfm |
| .200" | 122 cfm | 97 cfm |
| .300" | 178 cfm | 133 cfm |
| .400" | 215 cfm | 156 cfm |
| .500" | 219 cfm | 170 cfm |
| .550" | 223 cfm | 176 cfm |
| .600" | 227 cfm | 180 cfm |
This is a used internal engine component and may show normal signs of previous use. The cylinder head is sold as pictured, so please review all images to confirm condition, completeness and any visible defects before ordering.
If you are unsure whether this 806 cylinder head is correct for your engine, compare it with your original part before ordering or contact us for guidance.