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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: Jan 2022 Posts: 116 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 116 | Just curious about a mark on the flywheel on the 216. I know that the timing is to be set when the "bb" on the flywheel is behind the pointer in the bell housing. That is a given. But, a couple degrees before the "bb", there is a triangle mark. What is the significance of that mark? I can't find any mention of it in the factory shop manual, and it has my curiosity up. | | | | | Joined: Jan 2000 Posts: 2,074 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 2,074 | | | | | | Joined: Jan 2022 Posts: 116 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 116 | Ah, soo! Didn't know that the triangle was for cam timing purposes. Not something for me to obsess over. Thanks for educating me! | | | | | Joined: Feb 2004 Posts: 29,740 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,740 | The triangle or the U/C mark on some flywheels is used for doing an "engine stopped" valve adjustment on solid lifter engines. The factory service manual specifies that six valves are adjusted with the indicator aligned with the pointer, then the engine is turned 360 degrees until the mark lines up again and the other six are adjusted. It's much more accurate than chasing a moving rocker arm with a wrench, a screwdriver, and a feeler gauge.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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