SBC oil galley plug behind drivers rear head leak

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SirRobyn0

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Joined
Dec 6, 2019
Posts
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Location
In the woods in Western Washington
First Name
Rob
Truck Year
1984
Truck Model
C20
Engine Size
305
I haven't seen this happen a lot at all but I have seen it before, but can't remember ever seeing a post about it so I thought I'd bring it up as something to keep in mind when looking for a mystery oil leak. This is a threaded plug that threads down into the block, on the sloped part of the block to the driver side of the oil pressure port. The cylinder head does not seal over it, but about half of the plug is covered over by the head. It's about impossible to see without a mirror, and can't be resealed without removing the driver side cylinder head. This is on a 77 C20 350, that came into the shop, the sad part of the story is he just had the engine rebuilt before he moved up here, less than 2,000 miles on it. This is a pressurized galley plug so it has the potential to gush oil. In his case it looked like they failed to tighten it up all the way so it back out. Lucky it hit the head before it could back all the way out.

Red arrow is where to oil pressure sending unit goes and I'm point that out for reference only.

Yellow arrow is the galley plug I talking about.
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