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Did you know that you can basically degree-in your camshaft using your damper? We used this ATI damper and Tavia pointer to properly indicate true TDC when the motor was first built. Then it was simple to check the intake valve-opening event on the damper with a dial indicator on the pushrod. Since most cams open the intake valve before TDC and most dampers are marked up to 60 degrees BTDC, this check is easy and quick.