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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!
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#54924 01/13/2006 3:04 AM | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | There should be a UIC mark also. The I between U and C is TDC or Upper Center. The ball should be 6 degrees before if it is a 51 flywheel.
The triangle is used when checking cam timing.
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