A must have for circle track racers! Simply remove the vacuum canister from your HEI distributor, and replace it with this vacuum lockout. The lockout has a pin that holds the vacuum advance portion of the star wheel in place. Note: Not compatible with PROFORM Ford HEI Distributors.

Product Features:

• Fits 1996 and Earlier GM HEI Distributors with a Clockwise Rotation
• Replaces Vacuum Advance Chamber
• Made from High-Quality Plastic Material
• Features a Black Finish
• 1-inch Stud Length