安装孔的预留空间使得在歧管变形时留有足够的变形空间，即使排气歧管变形也不会剪断通过安装孔的螺栓。

The obligating space on the hole makes the exhaust manifold having enough space when deforming and preventing cutting out the bolt even the exhaust manifold is deformed.

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安装孔的预留空间使得在歧管变形时留有足够的变形空间，即使排气歧管变形也不会剪断通过安装孔的螺栓。

The obligating space on the hole makes the exhaust manifold having enough space when deforming and preventing cutting out the bolt even the exhaust manifold is deformed.

youdao