Tailor pump shot to individual engines.
Includes 8 pump cams to fine-tune your Holley carb's accelerator pump shot. Another great tuning kit from Holley. This one will allow you to "tailor" accelerator pump performance to the engine's actual requirements. Each cam has a different shape or profile to give different results. Cam "lift" directly affects the accelerator pump stroke and, therefore, pump capacity. Ramp profile or shape controls the "timing"of the shot. A steeply-rising ramp shape will give a fast, heavy fuel shot right off idle. Conversely, a gently sloping ramp will spread the pump action over a longer period of time.