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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Feb 2020 Posts: 3 New Guy | | New Guy Joined: Feb 2020 Posts: 3 | I have a '62 C60 and I'm having to replace the head. I have a question about the mold numbers. Is this a good place to ask it? Sorry never done the forum thing before. | | | | | Joined: Feb 2020 Posts: 3 New Guy | | New Guy Joined: Feb 2020 Posts: 3 | Did you ever find out what the GM-5 means? I have same mold buy mine says GM-4. I think I found a replacement but it says GM-5. And trying to see if that makes a difference. TIA | | | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | GM5. That is the mold (also called pattern) number to identify it in case of a problem with a casting. There were several molds for same block/head. Several foundrys. Determine application by the casting number/part number and date codes.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
| | | | | Joined: Mar 2004 Posts: 6,212 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,212 | Welcome to the Stovebolt  Are you working on a 6-cylinder or V8? Mike B 
Last edited by Mike B; 02/18/2020 2:28 AM.
| | | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | Did you ever find out what the GM-5 means? I have same mold buy mine says GM-4. I think I found a replacement but it says GM-5. And trying to see if that makes a difference. TIA So you knew it was a mold number? or did you change your post?
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
| | | | | Joined: Apr 2005 Posts: 7,440 Bolter | | Bolter Joined: Apr 2005 Posts: 7,440 | There’s been some moderatin (not me) going on. 
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | I'm kind of lost. Can't remember if he already knew, which means I am losing it. I was thinking he wanted to know what the GM5 was. I didn't notice he had already called it a mold number. If someone has changed the original two posts, that was a bad idea.
If they have not been changed, then I need medicine.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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