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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old February 12th, 2016, 06:57 PM
atomman atomman is offline
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Default V-6 Head serial numbers

Trying to ID the application for this Sn; 23466811 with large valves, Magnum?
Have four of them. Also Sn: 243664--, the last two numbers are no readible.
atomman.
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  #2  
Old February 12th, 2016, 07:22 PM
bigblockv6 bigblockv6 is offline
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Default Re: V-6 Head serial numbers

I've got both Magnum intake and exhaust valves, here are the part numbers: Intake valve 2476368. Exhaust valve 2476374. the valves you have are much earlier part numbers, might be for earlier non Magnum 401 and 478 engines. I'll some of my parts books and see if those numbers come up.

Last edited by bigblockv6; February 12th, 2016 at 10:14 PM.
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  #3  
Old February 12th, 2016, 07:28 PM
atomman atomman is offline
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Default Re: V-6 Head serial numbers

Thanks. The Sn: is cast into the head, I don't have them apart yet. Just picked them up 2 weeks ago. Unpacking the crates.
atomman
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Old February 12th, 2016, 08:59 PM
bigblockv6 bigblockv6 is offline
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Default Re: V-6 Head serial numbers

So those were the part numbers for the cylinder heads? again they are very early numbers, my 66 401 Magnum heads first year production are part number 2421158.
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Old February 12th, 2016, 11:13 PM
atomman atomman is offline
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Default Re: V-6 Head serial numbers

Attached are some pix showing the Sn: and valves in head.
Atomman
Attached Images
File Type: jpg GMNC head 1.jpg (163.9 KB, Multiple views, 9 clicks)
File Type: jpg head 2.jpg (96.5 KB, Multiple views, 4 clicks)
File Type: jpg IMG_1905.jpg (103.7 KB, Multiple views, 4 clicks)
File Type: jpg valve 1.jpg (98.9 KB, Multiple views, 5 clicks)
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  #6  
Old February 12th, 2016, 11:52 PM
bigblockv6 bigblockv6 is offline
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Default Re: V-6 Head serial numbers

The pic on the left shows the head with larger valves but the only way to know if they are Magnums is by the intake and exhaust ports. Gets some pics taken of the ports then I can tell you what you've got
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  #7  
Old February 12th, 2016, 11:59 PM
bobdylan bobdylan is offline
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Default Re: V-6 Head serial numbers

magnumheads.jpg

magnumheads2.jpg
Couple of pictures showing difference magnum vs. non magnum. Bob
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  #8  
Old February 13th, 2016, 12:15 AM
bobdylan bobdylan is offline
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Default Re: V-6 Head serial numbers

Found an old post by BigblockV6 2/27/13 casting number for magnum head 2421158
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  #9  
Old February 13th, 2016, 12:37 AM
bigblockv6 bigblockv6 is offline
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Default Re: V-6 Head serial numbers

Yes I reposted that number nearly 2 hours ago Another part number used for Magnum heads in 1973-74 is 696030.
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  #10  
Old February 13th, 2016, 12:47 AM
bigblockv6 bigblockv6 is offline
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Default Re: V-6 Head serial numbers

I also like to point out that Magnum intake vales are 2 1/4 inches in diameter.
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