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More than one oil pressure port on a 350 V8?

Monte1

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Monte1 Enthusiast

Monte1

Posted
Posted

Hello Guys,

 

I'm kinda new here. I'm interested in putting a new oil pressure gage on my '78 Custom 10 350 V8 Auto. The dash one failed. I could put the new electric sender in the same hole that the original sits in, but it's got a larger can-type sender than the original. Is there another oil port plug somewhere on the engine that could be used? I see plugs down low just above the oil pan on both sides of the engine, but suspect they are block coolant drains. Thanks for any help! :thumbs:

miket Enthusiast

miket

Posted
Posted
Hello Guys,

 

I'm kinda new here.  I'm interested in putting a new oil pressure gage on my '78 Custom 10 350 V8 Auto.  The dash one failed.  I could put the new electric sender in the same hole that the original sits in, but it's got a larger can-type sender than the original.  Is there another oil port plug somewhere on the engine that could be used?  I see plugs down low just above the oil pan on both sides of the engine, but suspect they are block coolant drains.  Thanks for any help!  :thumbs:

 

 

 

 

I believe there is a port by the dist that should be a fit for your sender.

Monte1 Enthusiast

Monte1

Posted
  • Author
Posted
Hello Guys,

 

I'm kinda new here.  I'm interested in putting a new oil pressure gage on my '78 Custom 10 350 V8 Auto.  The dash one failed.  I could put the new electric sender in the same hole that the original sits in, but it's got a larger can-type sender than the original.  Is there another oil port plug somewhere on the engine that could be used?  I see plugs down low just above the oil pan on both sides of the engine, but suspect they are block coolant drains.  Thanks for any help!  :thumbs:

 

 

 

 

I believe there is a port by the dist that should be a fit for your sender.

 

 

 

 

 

Thanks, mikeT. I'll take a look for that port. There's a lot of stuff back there including a lot of vacuum lines for that honkin' 4-barrel Rochester.

Friz Enthusiast

Friz

Posted
Posted

The oil pressure port is right behind the distributor. If you end up with a bigger or smaller fitting on your gauge hose, just go to a plumbing shop and get an adapter. It will not change any of your indications.

  • 2 weeks later...
RSHugger Enthusiast

RSHugger

Posted
Posted

:ughdance: Not sure how far along you have gotten with this but.... as you mentioned the larger can type sending unit won't fit in the same location as the smaller idiot light sender in the same orientation. What GM did was use a 45 degree fitting that screwed into the back of the block and allowed the sender to angle towards the firewall and this gave you the clearance required to make it fit and get the wire connected. You may have difficulty finding this piece at NAPA... maybe not, but you should be able to find them in the wrecking yards easy enough. The GM unit was a single piece but you may be able to use a 45 degree block with a short 1/8" NPT nipple to get it to clear the manifold. Should work fine for you. The plugs that you see down low are to the water jacket... blocks 68 and older had an oil port at the front of the block for the remote oil filter but that is about it for extra oil ports.

 

Happy motoring.

 

Roger

miket Enthusiast

miket

Posted
Posted
:smash:  Not sure how far along you have gotten with this but.... as you mentioned the larger can type sending unit won't fit in the same location as the smaller idiot light sender in the same orientation.  What GM did was use a 45 degree fitting that screwed into the back of the block and allowed the sender to angle towards the firewall and this gave you the clearance required to make it fit and get the wire connected.  You may have difficulty finding this piece at NAPA... maybe not, but you should be able to find them in the wrecking yards easy enough.  The GM unit was a single piece but you may be able to use a 45 degree block with a short 1/8" NPT nipple to get it to clear the manifold.  Should work fine for you.  The plugs that you see down low are to the water jacket... blocks 68 and older had an oil port at the front of the block for the remote oil filter but that is about it for extra oil ports.

 

Happy motoring.

 

Roger

 

 

 

 

I have a 502 in my 71 and had to replace the hard metal line that supplied pressure to the oem mech gauge. I ended up going the braided line route and used the original location on the motor...down by the oil filter. A complete write up with pics is located on classic gm trucks forum.

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