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Mod | | | Forums66 Topics128,090 Posts1,056,024 Members48,432 | | 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: Apr 2019 Posts: 10 'Bolter | | 'Bolter Joined: Apr 2019 Posts: 10 | When did Chevy change the oil groove on the rocker arms from inline with the oil hole to offset. On my '56 235 the casting numbers went from 5,6,7,8 and the oil groove is lined up with the oil hole. I also have a set that have 85, 86 etc. casting numbers with the offset oil groove. What year did the change happen? Thanks! | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 |
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Apr 2019 Posts: 10 'Bolter | | 'Bolter Joined: Apr 2019 Posts: 10 | Thank you for the quick reply! | | |
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