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Old 07-17-2017, 03:20 PM   #1
Bo's 55
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Default purpose of threaded hole in block

What is the purpose of the threaded hole in the driver's side of a 350 block near the rear and just above the oil filter? The threads are one inch deep but the hole goes inside at least five inches. Also what is the thread size? I want to plug it but a 7/16 bolt feels a little loose in the threads.
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Old 07-17-2017, 03:26 PM   #2
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I used that hole for the oil gauge. Originally it was plugged off.
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Old 07-17-2017, 05:37 PM   #3
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Is that the clutch pivot point for manual transmissions?
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Old 07-17-2017, 06:49 PM   #4
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Is that the clutch pivot point for manual transmissions?
I am thinking same as you Steve.
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Old 07-17-2017, 07:02 PM   #5
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Quote:
Originally Posted by Bo's 55 View Post
What is the purpose of the threaded hole in the driver's side of a 350 block near the rear and just above the oil filter? The threads are one inch deep but the hole goes inside at least five inches. Also what is the thread size? I want to plug it but a 7/16 bolt feels a little loose in the threads.
Thanks
The smaller hole just above the filter is for the oil pressure switch. it's a 1/8" npt hole. The other is just 7/16 threaded hole. I have just gone thru this. The oil pressure switch hole is difficult to see. What I found is that the oil switch hole on my crate engine 1985 design is smaller than older versions.
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Old 07-17-2017, 08:03 PM   #6
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The pivot ball hole will be a straight thread, but it won't be 5" deep. It will be forward of the oil filter if even there.

The hole above the oil filter is as discussed, an oil passage. You have to put something in it - a plug, a switch, or a line fitting. Most of the ones I've seen are 1/4" pipe, but as said some could be different.
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Old 07-17-2017, 09:02 PM   #7
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It does look like threads for a pivot ball. For an experiment I fed a length of green shrink tubing into the hole and found that it entered the cavity between the block and the flywheel that I could see with the inspection cover removed under the flywheel.
Thanks Guys
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