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  #1  
Old Nov 20th, 09, 9:53 AM
68 malibu wagon 68 malibu wagon is offline
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kentt
 
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Default BBC oil pressure sending unit location

A friend of mine is putting a 396 into his 55 Chevy. The typical spot to mount the oil pressure line is directly above the center of the oil filter. He says that the normal oil pressure line spot is in the way of his Z bar. There is also a plug in the block in front of the normal oil pressure sending unit location (about 2 inches). He is wondering if he can take the plug out of the block, and put his oil pressure line in the front hole, and plug the hole that is centered above the oil filter. THanks!
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  #2  
Old Nov 20th, 09, 11:14 AM
Mike Mike is offline
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Default Re: BBC oil pressure sending unit location

There's 5 plug's that are in line with the main bearing cap's on the driver's side of the block that can be used.
There's also 1 on the front of the block on the driver's side that's the same galley as the rest.
You can use any of those to install the sender.
And ,Yes ,plug the one's you aren't using.
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  #3  
Old Nov 20th, 09, 11:47 AM
DaleM DaleM is offline
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Default Re: BBC oil pressure sending unit location

Can't attest to other ports but I used this one on the front, driver side for my oil pressure gauge. I had the original plug removed when the engine was apart after it was hot-tanked. The original plug would not come out before the tanking due to age; could have just been this particular instance but something to consider...

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  #4  
Old Nov 20th, 09, 12:26 PM
Mike Mike is offline
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Default Re: BBC oil pressure sending unit location

Well ,that makes it easy.
3 of the plug's I described are shown in Dale's pic. -thank's Dale.
The recessed one in front of the block and the one behind the motor mount give you an idea where they are .
The other 3 are spaced accordingly toward the rear of the block ,inline with the brass plug and the one behind the motor mount.
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  #5  
Old Nov 20th, 09, 1:29 PM
oman oman is online now
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Default Re: BBC oil pressure sending unit location

Quote:
Originally Posted by DaleM View Post
Can't attest to other ports but I used this one on the front, driver side for my oil pressure gauge. I had the original plug removed when the engine was apart after it was hot-tanked. The original plug would not come out before the tanking due to age; could have just been this particular instance but something to consider...

I have read (and I CANNOT verify this) that the commonly used plug on the block may not give the most accurate reading. I have electric guages from a reputable guage supplier and they suggest using a spot other than above the oil filter. Their installation instructions say something about the above the filter location pressure readings being subject to actions of the bypass valve in the oil filter mounting. I need to reread the instructions.

I gotta add I do not recall many factory BBCs having pressure guages or even idiot light senders connected to spots other than above the filter.
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  #6  
Old Nov 20th, 09, 1:42 PM
DaleM DaleM is offline
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Default Re: BBC oil pressure sending unit location

Quote:
Originally Posted by oman View Post
I have read (and I CANNOT verify this) that the commonly used plug on the block may not give the most accurate reading. I have electric guages from a reputable guage supplier and they suggest using a spot other than above the oil filter. Their installation instructions say something about the above the filter location pressure readings being subject to actions of the bypass valve in the oil filter mounting. I need to reread the instructions.

I gotta add I do not recall many factory BBCs having pressure guages or even idiot light senders connected to spots other than above the filter.
I had both a Dakota Digital setup electric gauge (mounted here) and an Autometer mechanical gauge (mounted above the oil filter) in mine. While I did notice a slight difference in readings, it wasn't more than 2-3 lbs and I attributed it to a couple of possibilities; different locations and/or different types of gauges, electric vs. mechanical.

The oil filter location was used on every BBC I've seen but probably more for convenience and shielding from road hazards - one reason I put the electrical gauge up front, if the wire or sender was damaged by a road hazard it wouldn't have been that big a deal. A broken mechanical line would be another matter.
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  #7  
Old Nov 20th, 09, 1:45 PM
68 malibu wagon 68 malibu wagon is offline
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Default Re: BBC oil pressure sending unit location

Once again, excellent information. Thanks for the help, Kentt
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  #8  
Old Nov 20th, 09, 1:58 PM
Georgia69 Georgia69 is offline
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Default Re: BBC oil pressure sending unit location

I don't have a z-bar (running a TH400) but my headers come very close to the plug above the oil filter. I put a 90-degree brass elbow into the plug, screwed the sender into the elbow (pointed straight back towards rear of car) and it is working mint.
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  #9  
Old Nov 20th, 09, 2:57 PM
Mike Mike is offline
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Default Re: BBC oil pressure sending unit location

Quote:
Originally Posted by oman View Post
I gotta add I do not recall many factory BBCs having pressure guages or even idiot light senders connected to spots other than above the filter.
They didn't come OEM in any other location but the port above the oil filter.
The other 6 port's I mentioned are the oil feed gallery for the main bearing's and work just fine for a gauge.
I usually use the one in the front as it's farthest from the pump and a straight line up the gallery.
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  #10  
Old Dec 3rd, 09, 10:46 AM
Abe Siegel Abe Siegel is offline
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Default Re: BBC oil pressure sending unit location

I just installed a newly rebuilt 402. I didn't know enough about the engine to have the machine shop touch the plugs, and the engine is now installed in the car. I'm in the process of getting everything back together.
I've stripped the plug above the oil filter, and one of the side oil galley plugs. The headers are in the way of it too. I'm trying to be real careful with the plug in the front of the engine, but it's not budging, and I'm trying not to strip it. I've used penetrating fluid, but its still not moving. Are there any alternatives that can be installed between the oil filter and the engine, or do I have to keep trying? I'm not to keen of drilling and retaping, particularly since I don't want to get shavings inside a newly rebuilt but not started engine.
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  #11  
Old Jan 8th, 10, 9:25 PM
67SS4speed 67SS4speed is offline
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Default Re: BBC oil pressure sending unit location

Thank you everyone. Great information and very informative past articles. Believe I'll go with the port above the oil filter.

Thanks again,
Chuck
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  #12  
Old Jan 9th, 10, 12:59 AM
pnugene pnugene is online now
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Default Re: BBC oil pressure sending unit location

My 454 came from an 83 Suburban, and the oil sender was located in
the oil gallery hole at the front of the block.
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  #13  
Old Jan 9th, 10, 2:25 AM
Bowevil Bowevil is offline
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Default Re: BBC oil pressure sending unit location

I used a 45 degree adapter on filter port to offset the Z-bar on the sender switch for my new electrical classic instruments gauge . I achieved perfect clearance between the header & Z bar that way.

Works Perfect.
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  #14  
Old Jan 9th, 10, 7:47 PM
dragsterjeff dragsterjeff is offline
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Default Re: BBC oil pressure sending unit location

Abe you may have to put your allen wrench in the plug. Hit it with a hammer to jar it like you are driving into the block. Do this to jar it. It will help on loosening it. Then spray some sort of knock loose agent (WD-40). Try to loosen it. If it moves a little and gets hard then stop and go the other way to tighten. Work it back and forth this way til it comes loose. And above all else make sure you allen wrench is correct and tight for the plug. Good luck. You may already know all this but just thought it might help if you didnt.
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  #15  
Old Jan 9th, 10, 8:22 PM
Keith Tedford Keith Tedford is offline
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Default Re: BBC oil pressure sending unit location

The one shown above, at the front of the block, is about the farthest from the oil pump and should show the lowest oil pressure. That's the number that you want to know.
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