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Click on image for the lowdown. 
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| | | Forums66 Topics128,070 Posts1,055,892 Members48,428 | | 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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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | There were a few starting in 48.
Rods got narrower and used thinner Babbitt.
Mains went to precision inserts.
Block water drain went from 1/8" to 1/4" pipe thread.
There are more but that is off the top of my head.
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