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Old 03-16-2013, 10:20 PM
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Hole on rear of block

I am building a 4 bolt 350 chevy (3970010) that was manufactured in 1971. While installing an Edelbrock 60899 head on the 1-7 bank I noticed a threaded hole at the top rear of the block that was half covered by the base of the head. Using a probe, it appeared there is a passage between it and place for the oil pressure sender. What the heck is this, and what do I do with it?

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Old 03-16-2013, 10:29 PM
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Originally Posted by bonobo View Post
I am building a 4 bolt 350 chevy (3970010) that was manufactured in 1971. While installing an Edelbrock 60899 head on the 1-7 bank I noticed a threaded hole at the top rear of the block that was half covered by the base of the head. Using a probe, it appeared there is a passage between it and place for the oil pressure sender. What the heck is this, and what do I do with it?
Can you post a picture?
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Old 03-16-2013, 10:52 PM
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It is above and a bit to the right of the clock symbol on the block. It is about 1/2 exposed.Click image for larger version

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Old 03-16-2013, 10:57 PM
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anything coming out of it? air? liquid?
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Old 03-16-2013, 11:05 PM
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Haven't started it yet. Maybe I could get a longer probe and try to figure out where it goes?
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Old 03-16-2013, 11:08 PM
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That is an oil galley. There should be a plug in it. If not. Thimgs will get real messy when engine is fired up.
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Old 03-16-2013, 11:10 PM
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Needs to be plugged.... leads to oil galleries.

Means head off to plug it.






Duke
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Old 03-16-2013, 11:15 PM
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Thanks to all who responded. Any idea of what type of plug that needs to be put in it.

Sure glad I joined this forum!!
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Old 03-16-2013, 11:21 PM
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1/4" npt with recessed drive. Common oil galley plug.
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Old 03-16-2013, 11:24 PM
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Thank you for saving me from a major headache.
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