Cylinder Head - Combustion Chamber
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| Service Description | Part No. | Price | Remarks | |
| Volume Equalization | 2 cylinders | 99900-000-331 | ￥14,000 | |
| 3 cylinders | 99900-000-332 | ￥20,000 | ||
| 4 cylinders | 99900-000-333 | ￥26,000 | ||
| 4 cylinders (flat) | 99900-000-334 | ￥27,000 | ||
| 5 cylinders | 99900-000-335 | ￥32,000 | ||
| 6 cylinders (inline) | 99900-000-336 | ￥38,000 | ||
| 6 cylinders (V) | 99900-000-337 | ￥40,000 | ||
| 8 cylinders (V) | 99900-000-338 | ￥51,000 | ||
| Volume Measurement + Compression Ratio Calculation | 4 cylinders | 99900-000-339 | ￥14,000～ | The detail information of the engine will be required. |
| 6 cylinders | 99900-000-340 | ￥20,000～ | ||
| Volume Measurement | 4 cylinders | 99900-000-349 | ￥8,000 | |
| 6 cylinders | 99900-000-350 | ￥11,000 | ||
| Volume Equalization + Chamber Polish | 2 cylinders | 99900-000-341 | ￥18,000 | |
| 3 cylinders | 99900-000-342 | ￥26,000 | ||
| 4 cylinders | 99900-000-343 | ￥33,000 | ||
| 4 cylinders (flat) | 99900-000-344 | ￥36,000 | ||
| 5 cylinders | 99900-000-345 | ￥41,000 | ||
| 6 cylinders (inline) | 99900-000-346 | ￥50,000 | ||
| 6 cylinders (V) | 99900-000-347 | ￥51,000 | ||
| 8 cylinders (V) | 99900-000-348 | ￥66,000 | ||
| Volume Enlargement + Equalization | 2 cylinders | 99900-000-351 | ￥21,000 | Combustion chamber design optimization |
| 3 cylinders | 99900-000-352 | ￥30,000 | ||
| 4 cylinders | 99900-000-353 | ￥40,000 | ||
| 4 cylinders (flat) | 99900-000-354 | ￥42,000 | ||
| 5 cylinders | 99900-000-355 | ￥50,000 | ||
| 6 cylinders (inline) | 99900-000-356 | ￥59,000 | ||
| 6 cylinders (V) | 99900-000-357 | ￥60,000 | ||
| 8 cylinders (V) | 99900-000-358 | ￥80,000 | ||
| Squish Modification | 3 cylinders | 99900-000-375 | ￥26,000～ | |
| 4 cylinders | 99900-000-376 | ￥29,000～ | ||
| 4 cylinders (flat) | 99900-000-379 | ￥43,000～ | ||
| 6 cylinders | 99900-000-377 | ￥40,000～ | ||
| 6 cylinders (V) | 99900-000-378 | ￥51,000～ | ||
| F20/F22C Chamber Modification for Squish Clearance | ￥29,000 | The modification for the case there is no enough clearance between the piston shoulder and the end of combustion chamber. | ||
*Cylinder head must be provide with all valves.
