1965 289 Engine rebuild. Need help IDing purpose of threaded holes in block!

65poppy · May 1, 2011

Is anyone has some good pics I would really appreciate if you share them with me.

Here's pic #1. This is the rear of the block. What is this threaded hole for? Is this a threaded casting hole that is supposed to be plugged?

Thanks!
Steve-o

woodsnake · May 1, 2011

Alex, what is "oil pressure sending unit?" For four hundred

67rcks · May 2, 2011

remains unused.
use it for lifting the engine if missing carb plate

dennis112 · May 2, 2011

67rcks said:
remains unused.
use it for lifting the engine if missing carb plate

Yep.

There is ONLY one place to get an oil pressure gauge reading out of a stock 289 b--the front LH side.

65coupe408w · May 2, 2011

isnt that the back right of the motor?

woodsnake · May 2, 2011

Is there no application, for a small block Ford for a pressure sending unit from the back of the engine?
I know that on all the engines I've worked on the oil pressure sending unit is up on the drivers side right above the oil filter.

Why would they need to bore a hole into the block, just for a mounting location?

65poppy · May 2, 2011

woodsnake said:
Alex, what is "oil pressure sending unit?" For four hundred

Is that hole in the first picture an oil passage?

I have the oil pressure sending unit mounted toward the front of the motor next to the fuel pump. If the hole toward the rear of the motor is for an oil pressure sending unit I will need to plug it so oil doesn't squirt all over the place whenever I start this motor!

I also need to put the extension in and make sure this is the correct switch for guages.

Thanks,
Steve-o

65poppy · May 2, 2011

67rcks said:
remains unused.

So if I leave that hole open nothing is going to come out of it when I crank the motor up....like water or oil?

Thanks,
Steve-o

dennis112 · May 2, 2011

65poppy said:
So if I leave that hole open nothing is going to come out of it when I crank the motor up....like water or oil?

Thanks,
Steve-o

65poppy said:
Is that hole in the first picture an oil passage?

Absolutely not an oil or water passage hole. It is a blind hole that doesn't go anywhere. You do not need to plug it.

65poppy said:
I also need to put the extension in and make sure this is the correct switch for guages.

What you picture above is the ONLY factory location on a sbf block to check for oil pressure.

Yes you will need an extension to use a sending unit for gauges.

65poppy · May 2, 2011

dennis112 said:
Absolutely not an oil or water passage hole. It is a blind hole that doesn't go anywhere. You do not need to plug it.

Why do you think Ford engineers took the time to thread a blind hole?

Steve-o

PS, can you take a look at this one too? I don't know what to do with this hole either...

Thanks!

woodsnake · May 2, 2011

I apologize for my previous ignorance.

I thought I had seen some other application for an oil pressure sending unit at the back of an engine block and was obviously confused!

65poppy · May 2, 2011

woodsnake said:
I apologize for my previous ignorance.

I thought I had seen some other application for an oil pressure sending unit at the back of an engine block and was obviously confused!

No problemo. Maybe they did it like that on some early Cougars?

Steve-o

dennis112 · May 3, 2011

65poppy said:
PS, can you take a look at this one too? I don't know what to do with this hole either...

Thanks!

Also a blind hole that doesn't go anywhere. Still there and threaded in later year blocks. Doesn't need plugged either.

2+2GT · May 3, 2011

woodsnake said:
I apologize for my previous ignorance.

I thought I had seen some other application for an oil pressure sending unit at the back of an engine block and was obviously confused!

That would be a Chevy.

CarMichael Angelo · May 3, 2011

I would like to know from 65 Poppy how you got the box w/ text, lines, circles and arrows ( sounds like a verse from Alice's Restaurant) into your posted pics? Would help me to be more specific when asking questions as well.

65poppy · May 3, 2011

madmike1157 said:
I would like to know from 65 Poppy how you got the box w/ text, lines, circles and arrows ( sounds like a verse from Alice's Restaurant) into your posted pics? Would help me to be more specific when asking questions as well.

I used Microsoft Excel.

dennis112 · May 3, 2011

65poppy said:

I looked closely at the 2 blocks I have and both have the same threaded holes. I made sure they were blind and then installed common 7/16 x 14 course threaded bolts in them. They were threaded that way for some type of mount. If they were for pressured lube they would have been tapped for NPT instead.

I've never seen either position used for anything other than maybe for a ground. It is possible that they may be there for use in some other application, like for commercial or boat use. Another guess is that Ford might have used them to hold a machining fixture. Since motors have universal applications, they all were machined similarly on the production line.

65poppy · May 4, 2011

dennis112 said:
I looked closely at the 2 blocks I have and both have the same threaded holes. I made sure they were blind and then installed common 7/16 x 14 course threaded bolts in them. They were threaded that way for some type of mount. If they were for pressured lube they would have been tapped for NPT instead.

I've never seen either position used for anything other than maybe for a ground. It is possible that they may be there for use in some other application, like for commercial or boat use. Another guess is that Ford might have used them to hold a machining fixture. Since motors have universal applications, they all were machined similarly on the production line.

Someone mentioned the engine ground strap. Does the engine ground strap bolt into the hole on the passenger side? Where does the engine ground wire bolt to the motor?

Thanks,
Steve-o

1965 289 Engine rebuild. Need help IDing purpose of threaded holes in block!

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