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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old September 4th, 2022, 10:40 PM
Mike Caldwell Mike Caldwell is offline
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Default Help with numbers on my 401

Finally getting started opening up my 401. It came out of a "New Idea" harvester, that's all I know.

Here's some pix of the numbers I've found on the top of the bellhousing. Will post more when I can get to the front of the engine.

Questions: is it a 401? any idea what year?
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File Type: jpg GMC bell housing nubers.jpg (769.2 KB, Multiple views, 6 clicks)
File Type: jpg GMC bell housing numbers2.jpg (811.4 KB, Multiple views, 2 clicks)
File Type: jpg gmc intake manifold numbers.jpg (1.39 MB, Multiple views, 9 clicks)
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  #2  
Old September 4th, 2022, 11:20 PM
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Funky61 Funky61 is offline
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Default Re: Help with numbers on my 401

Check the Intake manifold and the exhaust manifolds as they should be dated and that may give you an idea
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Old September 4th, 2022, 11:58 PM
Mike Caldwell Mike Caldwell is offline
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Default Re: Help with numbers on my 401

Third pix in OP shows the numbers on the intake manifold.

Any help?
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Old September 5th, 2022, 12:19 AM
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Default Re: Help with numbers on my 401

That looks like the rear portion behind the carb area. I have similar numbers on my 401.

Here is the driver side front pad that shows the firing order and a date


New Idea Harvester repowered section from Jollys Page
http://6066gmcguy.com/V6powered.html
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File Type: jpeg 99C06799-8969-4B1D-88B2-9510393E4D79.jpeg (2.67 MB, Multiple views, 5 clicks)
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Last edited by Funky61; September 5th, 2022 at 01:15 AM.
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Old September 5th, 2022, 02:46 AM
Mike Caldwell Mike Caldwell is offline
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Default Re: Help with numbers on my 401

Pix shows entire intake; only numbers are the ones in the closeup and the firing order on the other side.
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Old September 5th, 2022, 03:43 AM
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Default Re: Help with numbers on my 401

It could be a 401, but not a magnum based on the intake manifold but,

The numbers you have in your first picture are the same stamped on my
401M: CWG4 2476579

So it may very well be a 401.

Here is what I have stamped on the front engine pad just below the right-side head.
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File Type: jpg IMG_1613.JPG (1.24 MB, Multiple views, 1 clicks)
File Type: jpg IMG_1620.JPG (1.20 MB, Multiple views, 2 clicks)
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Old September 5th, 2022, 03:45 AM
Mike Caldwell Mike Caldwell is offline
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Default Re: Help with numbers on my 401

I'll try and get to the front end tomorrow and see what I can find.

Thanks for the help!
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Old September 5th, 2022, 03:52 AM
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Default Re: Help with numbers on my 401

You're welcome and since the intake is off post a photo of the head passages to see if they are magnums.

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Old September 5th, 2022, 11:10 PM
Mike Caldwell Mike Caldwell is offline
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Default Re: Help with numbers on my 401

Here's the stamped numbers on head and good closeup of ports.

Couldn't get real clear look at numbers but it's a 401!
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File Type: jpg gmc stamped numbers.jpg (264.6 KB, Multiple views, 12 clicks)
File Type: jpg GMC intake ports.jpg (873.3 KB, Multiple views, 4 clicks)
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