- Fuel Injector Size Calculator -

This calculator estimates the best size injectors for your application. For truly accurate injector matching, many more variables must be taken into consideration, like displacement, air flow, RPM range, etc... Also the engine should be dynoed to get accurate information regarding fuel consumption and HP. But this will give you a rough idea. You will note that the stock injectors are good to a considerable amount of power.

For reference, the stock injectors on TPI cars are 18.13 lbs per hr at approximately 36 PSI for a 305, 23.92 lbs per hr at approximately 43.5 PSI for a 350.
Clicking on a value written in blue will give you more information on it.