Wanted plug for 396 427 four bolt main motor

[leach]

Looking for correct plug for 396 427 four bolt main motor in the pictures I have provided they were on the 65 66 67 68 69 70 motors which the big block four bolt mains were different size then the others.

[leach]

Here is picture of where plug belongs

[70Z28RS5151]

It looks like something you could find in the plumbing dept. at a hardware store.

[leach]

Thought so but cant match up correct size hole measures 1 inch.

[69 Post Sedan]

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Thought so but cant match up correct size hole measures 1 inch.

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Not sure but I think this is a 3/4 inch pipe plug.

[3macs1]

[ QUOTE ]
Looking for correct plug for 396 427 four bolt main motor in the pictures I have provided they were on the 65 66 67 68 69 70 motors which the big block four bolt mains were different size then the others.

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Hi Barry:
I asked this question in Bill's post for one for a 69 but no one commented. I had a box of 10 of those NOS GM that I bought when I raced the 66 l-72's.Mine have "W" cast into them as did the ones on my 66 engines.If that works for you send me a PM with your address and I will send one down to you. $10.00 will cover it of which $7.50 is shipping to the US which is hard to take.
Here are pictures of my nos ones

[3macs1]

My God what is so special about this plug?? Please hold off guys on the PM's requesting them.I had a box of ten but don't have 10 now, used some myself years back. I found 2 this morning. Barry get first crack at one if he wants it.After that I am not sure at what I have left but will look.
thanks Joe

[Xplantdad]

That's nice of you to do Joe...

[Bill Rose]

I bought one at Lowes last week for $1.09 It said 3/4 on top. I ground it off and painted it orange.

[PeteLeathersac]

Rooting through the toolbox junk drawer for something else I came up on one of these the other day too..
It's similar to the lower pic of Joe's w/ a diamond shape on the head but in a deeper recessed circle..
I looked to this thread to compare but didn't repond when seeing Barry had noted he wanted a 'correct' one and the head on his pic shown is smooth also taller in the square part of the plug than this one has..

Aside from the diamond/circle part, this one's a 1" plug and looking into the bottom it's recessed smoothly and looks kinda' like the inside of a trim tag rivet..
It's about 1-1/16" total height, the thread part is about 5/8" high and the square part above the threads about 7/16" high...the square itself is 5/8"..

Happy to pop it in the mail to Barry if it's suitable...or if it's no good to him, someone else can have it after he responds?.

Thinking further, are waterpump bypass plugs the same size and an outie head too?.

~ Pete