What size holley carb do you need for a 427?

It depends on the application, but a 750 should do a good job. If it's being used for drag racing, and the engine is being revved over 6500, you might need to go bigger.
It depends on the application, but a 750 should do a good job. If it's being used for drag racing, and the engine is being revved over 6500, you might need to go bigger.