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Click on image for the lowdown. 
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| | | Forums66 Topics128,041 Posts1,055,483 Members48,424 | | 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: Nov 2000 Posts: 1,966 'Bolter | | 'Bolter Joined: Nov 2000 Posts: 1,966 | Those casting numbers on the block are the last three digits from all of the different heads that fit that block. Mike B  Mike, I have never heard or read that before. Where did you get that information? I'd like to know more. The picture JoeR posted is of a head, and I have never understood what those markings mean. Thanks.
Professional Novice
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