50cc on the left 30cc on the right. Noticeable difference. According to this article...all 4150/4160 carbs came with 30cc pumps on the primary side

https://www.holley.com/blog/post/accelerator_pump_tuning_for_holley_carburetors/

As stated...enter your carb list# here(on the airhorn) and you should find all the original specs for the carb

https://www.holley.com/support/carburetor/