Controls distributor vacuum timing advance. If engine pings at light to medium throttle, this device can allow lower octane fuel usage. Still allows full vacuum advance with light engine load (fully adjustable).

• Machined from billet aluminum and solid brass
• No moving parts (lasts forever)
• Controls light to medium throttle engine pinging
• Fast easy adjustment
• Includes vacuum hose. No alterations to car needed.
• Units have been in use for nearly 40 years

Unit arrives in bulk packaging. No returns accepted. All sales final.