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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

what the hell is that!

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Old Jun 28, 2011 | 05:10 PM
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Default what the hell is that!
okay so i pulled my motor a few days ago, she turned 100k so i thought i would freshen it up and what not, and found this little hole between the intake and the block on the backside of the engine, what is it, and why is it there?
Attached Thumbnails what the hell is that!-photo_d87f58fd-ed91-2063-ade8-262dbe39e70c.jpg  
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Old Jun 28, 2011 | 06:11 PM
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looks to me like someone drilled a hole in it.. i have no idea why..
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Old Jun 28, 2011 | 07:05 PM
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Btw is the hole going into the head at all? hard to tell from the picture.
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Old Jun 28, 2011 | 07:34 PM
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That is weird, can you get a better pic at all?
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Old Jun 28, 2011 | 07:39 PM
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Get the oil off and then get us a real picture. I would be for the oil sender, but I can't see a damn thing in that picture. Some of the 94's did have their sender up top and others on the bottom above the filter.
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Old Jun 28, 2011 | 07:41 PM
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Looks like the normal intake leak to me.
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Old Jun 28, 2011 | 07:54 PM
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You buy this car used? I am thinking it is either an attempt or a leftover from a hidden direct port system.
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Old Jun 28, 2011 | 07:57 PM
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I can't see a damn thing in that picture. Some of the 94's did have their sender up top and others on the bottom above the filter. That hole doesn't look to be in the right place for the sender thou, it does look to be the source of your massive oil leak.
Last edited by fex77k; Jun 29, 2011 at 07:35 PM.
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Old Jun 28, 2011 | 08:15 PM
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My guess is the cross drilled hole that connects the top oil port for the pressure sensor to the oil passage. It has a plug in it.

Al
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Old Jun 28, 2011 | 09:00 PM
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Custom PCV hole....
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Old Jun 28, 2011 | 09:03 PM
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I don't think it was for the oil pressure sensor it is way to close too the head; my oil sensor is closer to the middle of the intake.
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Old Jun 28, 2011 | 09:25 PM
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It's just a normal oil passage which should have either a soft plug or a pipe plug in it just make sure when you get your block back from the machine shop that either a pipe or soft plug is put back in otherwise upon startup all of the oil will leak from your engine and kill it.
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Old Jun 28, 2011 | 09:28 PM
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Looks like the oil sending unit...but the pic needs to be a bit better...
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Old Jun 28, 2011 | 09:31 PM
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It's an oil gallery hole that has a plug in it. Every LT1 block has it.
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Old Jun 29, 2011 | 09:56 AM
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From: Jackstandican
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That's an oil plug? Maybe my eyes deceiveth me, but that looks like a hole drilled into the block? It's under the head as well which looks to be in the wrong location for an oil galley plug...
It would explain the massive amount of sludge all over creation as well...
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Old Jun 29, 2011 | 10:11 AM
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Originally Posted by SS RRR


That's an oil plug? Maybe my eyes deceiveth me, but that looks like a hole drilled into the block? It's under the head as well which looks to be in the wrong location for an oil galley plug...
It would explain the massive amount of sludge all over creation as well...
agreed thats a cleanly bored hole not threaded.........i have no idea why someone would do that???
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Old Jun 29, 2011 | 10:20 AM
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Originally Posted by quik95lt1
agreed thats a cleanly bored hole not threaded.........i have no idea why someone would do that???
Like I said earlier... I think it may have been something left over from a hidden direct port system under the manifold.
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Old Jun 29, 2011 | 10:24 AM
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Originally Posted by SS RRR
Like I said earlier... I think it may have been something left over from a hidden direct port system under the manifold.
yea i agree thats about all i can think of unless somebody had a really bad idea for a crank case ventilation point lol........id be curious to see if there are any holes in the bototm of the intake manifold......that will tell it
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Old Jun 29, 2011 | 10:28 AM
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Originally Posted by shbox
It's an oil gallery hole that has a plug in it. Every LT1 block has it.
Yeah that's what it looks like to me. Definitely not for some hidden nitrous lulz.
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Old Jun 29, 2011 | 10:30 AM
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Yeah that is in no way a factory deal there, that's odd.
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