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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | There is a hole there, but its the wrong one. I'm not sure why GM put a hole there, it just confuses people. You want the hole on the passenger's side, just above/behind the starter. It should have a little pointer in there if you look deep enough. I'm not sure what the 7/32" measurement is, just time it so #1 fires when the ball meets the pointer. You can probably run it advanced a few degrees from that if you want because modern gas is much higher octane than the old stuff and the compression on these engines is pretty low.
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