Comp Cams 4792 Top Dead Center Stops; 18mm Bolt Style, Heads On (Most Engines)

Comp Cams 4792 Top Dead Center Stops; 18mm Bolt Style, Heads On (Most Engines)

• Positively stop piston in order to find Top Dead Center (TDC)

• Bolt style screws into spark plug hole while plate type bolts across any cylinder bore when heads are off