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Mod | | | Forums66 Topics128,049 Posts1,055,740 Members48,426 | | 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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| | | Joined: Dec 2006 Posts: 1,154 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,154 | Don't know if this helps but on our 1957 235 the marks look like this I O I with the " O " in this case as a stand in for the small BB that is impressed into the flywheel. For the 1957 235 engine timing is pointer lined up on the BB..... so states the manual. I think the other marks are for valve timing but I could be wrong and will be corrected in short order.....T/C Steve | | |
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