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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old February 25th, 2013, 08:05 PM
Mike Caldwell Mike Caldwell is offline
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Default Magnum vs standard head pix

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.
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Old February 25th, 2013, 08:20 PM
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Default Re: Magnum vs standard head pix

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.
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Old February 25th, 2013, 08:38 PM
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Default Re: Magnum vs standard head pix

This would be the place to look:

http://67-72chevytrucks.com/vboard/s...d.php?t=316774
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Old February 25th, 2013, 10:04 PM
Mike Caldwell Mike Caldwell is offline
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Default Re: Magnum vs standard head pix

That's what I was looking for!

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

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Old February 25th, 2013, 10:26 PM
AHarman AHarman is offline
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Default Re: Magnum vs standard head pix

Yes, a good pair of used Magnum heads should go for ~$200.
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Old February 25th, 2013, 11:54 PM
Mike Caldwell Mike Caldwell is offline
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Default Re: Magnum vs standard head pix

Quote:
Originally Posted by AHarman View Post
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
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Old February 26th, 2013, 03:50 PM
Mike Caldwell Mike Caldwell is offline
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Default Re: Magnum vs standard head pix

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 --
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Old February 27th, 2013, 04:19 PM
bigblockv6 bigblockv6 is offline
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Default Re: Magnum vs standard head pix

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
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