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Click on image for the lowdown. 
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| | | Forums66 Topics128,012 Posts1,055,318 Members48,419 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | 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
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