Used 706 Cylinder Head #030
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Used GM LS 706 Cylinder Head, Cathedral Port
This is a used OEM-style GM LS 706 cylinder head. The 706 casting is a cathedral port LS cylinder head commonly found on 4.8L and 5.3L GM LS-based engines, including applications such as LM7, L59, LM4 and LR4.
706 heads are popular for stock replacement, budget LS builds and small-bore LS applications where the smaller combustion chamber helps maintain or increase compression. They are often used in LS combinations where a simple, affordable factory cylinder head is preferred over more expensive aftermarket options.
Because of the smaller combustion chamber, 706 heads are also commonly used in budget performance builds where increasing compression is part of the engine combination. This makes them a popular choice for cost-conscious LS builds, including some high power turbo or supercharged setups when combined with the right short block, camshaft, fuel system and tuning.
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 706 cylinder head is intended for GM LS cathedral port applications. It is commonly associated with 4.8L and 5.3L LS engines such as LM7, L59, LM4 and LR4.
Always compare the casting number, port shape, combustion chamber style, valve size and bolt pattern with your original cylinder head before ordering.
Suitable For
- GM LS 706 cathedral port cylinder head applications
- 4.8L and 5.3L LS-based engines
- LM7, L59, LM4, LR4 and similar LS engine applications
- Stock replacement and repair work
- Budget LS engine builds and rebuilds
- LS combinations where a smaller combustion chamber is used to help increase compression
- Small-bore LS applications where 706-style heads are required
Product Details
- Condition: Used
- Casting number: 706
- Type: LS cathedral port cylinder head
- Application: GM 4.8L / 5.3L LS-based engines
- Common engine codes: LM7, L59, LM4, LR4
- Combustion chamber: Approx. 61cc
- Intake port volume: Approx. 200cc
- Exhaust port volume: Approx. 70cc
- Intake valve size: 1.89 inch
- Exhaust valve size: 1.55 inch
- Quantity: Sold each
Typical Stock Flow Numbers
| Valve Lift | Intake Flow | Exhaust Flow |
|---|---|---|
| .100" | 63 cfm | 54 cfm |
| .200" | 128 cfm | 93 cfm |
| .300" | 179 cfm | 121 cfm |
| .400" | 210 cfm | 145 cfm |
| .500" | 218 cfm | 163 cfm |
| .550" | 221 cfm | 168 cfm |
| .600" | 226 cfm | 174 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 706 cylinder head is correct for your engine, compare it with your original part before ordering or contact us for guidance.