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B20b vs b18b1 block

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Old Nov 8, 2022 | 06:48 PM
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Taz88
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Default B20b vs b18b1 block
Can someone explain what this hole is for? I was told the blocks were identical so I’m trying to figure out what to do about this.

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Old Nov 8, 2022 | 10:22 PM
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Default Re: B20b vs b18b1 block
That is the return port for an oil separator box. It can be plugged if you wish to use the B18B block like a B20B block.
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Old Nov 9, 2022 | 08:00 AM
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Default Re: B20b vs b18b1 block
To clarify a little further - the breather chamber is only on OBD1 ('94 - '95) B18B blocks. OBD2 engines have the breather chamber built into the valve cover and are the same as B20B/Z blocks (which only came along after OBD2).

OBD2 system in the left inset, OBD1 system to the right:




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