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View Full Version : Magnum vs standard head pix


Mike Caldwell
February 25th, 2013, 08:05 PM
Anybody got a good side-by-side pix of two heads to show the difference?

There's a pair of heads on ebay but seller doesn't know difference and his pix don't show the exhaust ports.

Listing is "CHEVY/GMC 63-73 401 351 V6 TRUCK CYLINDER HEADS"

All he says is "These heads fit 2 ton gmc truck with a industrial v6 engine"

If there was a good pix to send him we might find out which he has.

Corts60
February 25th, 2013, 08:20 PM
If those are the ones listed for $800, I wouldn't pay that price whether they were magnum or not.

But, if you google gmc 351 magnum, click on the images tab and I'm pretty sure someone has a pic on there of them side by side.

6066gmcguy
February 25th, 2013, 08:38 PM
This would be the place to look:

http://67-72chevytrucks.com/vboard/showthread.php?t=316774

Mike Caldwell
February 25th, 2013, 10:04 PM
That's what I was looking for!

And no, not for $800, even if they are Magnum "just as good as new" heads.

http://i226.photobucket.com/albums/dd85/67_C-30/GMC%20V6%20pics%20305%20305E%20351%20401%20432%204 78%20Magnum/Pictures582.jpg

AHarman
February 25th, 2013, 10:26 PM
Yes, a good pair of used Magnum heads should go for ~$200.

Mike Caldwell
February 25th, 2013, 11:54 PM
Yes, a good pair of used Magnum heads should go for ~$200.

What's a good valve job cost? One for a Chevy was ~$300, but even adding them together leaves a lot of room under $800

Mike Caldwell
February 26th, 2013, 03:50 PM
Reply from seller:

"The only markings on the head is the casting number the date code and a M.The intake gasket listed for the magnum has the same pattern as these heads.If there is another way to indentify the heads i will be glad to ck it.Thanks"

Does the "M" mean "Magnum"?

I might have to consider making an offer --:confused:

bigblockv6
February 27th, 2013, 04:19 PM
The best way to determine which heads they are is by the part number cast in the rocker arm area, 66-72 magnum heads will have part #2421158, 73-74 Part #696030 or 696031