Most remanufactured, parts-store distributors come with generic mechanical (centrifugal) timing curves that bear little resemblance to what the OEM originally engineered for the engine.
Complicating matters further, even factory ignition curves were intentionally conservative—and heavily influenced by emissions requirements. As the EPA implemented the Clean Air Act in the late 1960s and early 1970s, ignition timing was designed primarily to pass tailpipe emissions testing, not to maximize performance.
A properly calibrated mechanical distributor unlocks measurable gains in both torque and peak horsepower. Just as importantly, it delivers sharper throttle response—both on tip-in and during transient acceleration.
From a stock remanufactured engine to our 800+ HP “557 Inch Beast,” every build has unique timing requirements. Total timing, advance rate, and the RPM at which full mechanical advance comes in must all be tailored to the specific combination.
We consider every variable: combustion chamber design, cylinder head material, vehicle weight, gearing, transmission type, stall speed, tire height, fuel choice, and intended vehicle use. Each of these factors plays a role in developing the correct ignition curve.
It’s also worth noting that very few aftermarket distributors come with a properly engineered performance curve out of the box. Every engine combination is different—and your timing curve should be, too.
Call for a quote on your particular application. Prices start at $289.95 for a custom curved BBF Dura-Spark as shown.