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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old December 29th, 2018, 06:09 PM
James James is online now
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Default A drilled hole in the side of the block.

Has anyone see this before? It look like a drilled hole.

The history on this engine:
I had bought a running engine (year unknown) about a year and a half ago from an auto mechanic. Apparently he is a mechanic trainee. The guy pulled it out (the day before I pick it up) to install a Chevy 454 engine. He didn't state anything was wrong with the engine (and I didn't ask). I was planning on overhauling it anyway. I had the heads off for a while and saw nothing wrong with them. This week I was able to disassemble the block. Found several problems with it. The oil filter by-pass valve was installed in the wrong hole (it was blocking the oil from the oil pump) look like he converted it to a spin on filter and afterward maybe causing oil pressure issues. When I pulled the pistons/rod assemblies two of the pistons had issues (one what a broken top ring and the other missing half of the broken ring). Long story short I have a solution for all of this, I just needed to share my experiences with this engine.
Attached Images
File Type: jpg Hole in the right side of the block 1.JPG (1.90 MB, Multiple views, 23 clicks)
File Type: jpg Hole in the right side of the block 7.JPG (1.82 MB, Multiple views, 16 clicks)
File Type: jpg Hole in the right side of the block 5.JPG (2.26 MB, Multiple views, 17 clicks)
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  #2  
Old December 30th, 2018, 07:54 AM
WE7X WE7X is offline
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Default Re: A drilled hole in the side of the block.

That looks like it would be in the water jacket, but the hole looks like it is in a factory cast boss.
I do not have a block to look at, but is that a hole for the block drain plug? Is there a similar one on the other side of the block?
Rod Johnson
Issaquah, WA.
1970 RM-7500 'Motor Home'

Last edited by WE7X; December 30th, 2018 at 07:56 AM. Reason: typo
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  #3  
Old December 30th, 2018, 10:59 AM
James James is online now
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Default Re: A drilled hole in the side of the block.

Yes it does go into the water jacket, I had place a drill bit in the hole to show that the hole went through. No there nothing similar on the other side.
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