| 摘要 |
A preformed article 10A, for a cylinder head, includes: a first portion 11 where a first through hole 15 is to be formed from an upper wall portion 18 to a central portion 19a which is a portion, of a bottom wall portion 19, forming a combustion chamber of an internal combustion engine; and a second portion 12A where a second through hole 16 is to be formed to the central portion 19a from an outer wall portion (for example, the upper wall portion 18) positioned above an intake port 14 which opens to the central portion 19a. The portions 11 and 12A are portions where a cooling water passage W is not formed. |
