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Click on image for the lowdown. 
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| | | Forums66 Topics128,157 Posts1,056,874 Members48,456 | | 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
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| | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Mike B, Here are locations of various casting codes. The date casting codes (for the block and for the head) will help you figure out what you have. My 1959 and 1960 USA 261s have side bosses and they were drilled (but I do not know if they were for side motor mounts)? | | |
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