Setting initial timing is only half the job. How fast the mechanical advance comes in decides what the engine feels like off idle and through the midrange, and a factory curve is deliberately lazy. Swapping the springs under the cap is the cheapest tuning change on a points distributor.

Mr. Gasket 925D Distributor Advance Spring Kit Features:

• Fits 1965-1973 Ford, Lincoln and Mercury V8 engines with points ignition.
• Lighter weight springs bring timing advance in more quickly than the stock distributor allows.
• Brings in timing more quickly than stock for more torque and horsepower, depending on your combination.
• Springs fit under the distributor cap.
• Sold as a kit.