This tool provides a positive stop for the piston when locating top dead center. It bolts down across the cylinder bore. Used with heads off. Sold individually.
Product Details:

• Top Dead Center Locator Tool
• For Use With Cylinder Head Removed
• Fully Adjustable
• For Use On Chevy V8 And Big Block Mopars With Maximum Spacing Of 5.5 Inches
• 5 Head Bolt Per Cylinder Max
• Made From Quality Billet Aluminum
• Black Anodized Finish
• Sold As Each