16 HP loss with the littles one
I saw a 20 HP increase on a 470 C.I. 440 motor with a tunnel ram with 2 750 CFM Jet prep Holley double pumpers going from no air cleaner to running two 9 inch tall velocity stacks with 10 x3 inch air cleaners mounted on the top of the stacks
The dyno operator said no way it would make more power with air cleaners on before that pull but the engine owner would not race it with them so we went ahead and tested them anyways and found out the dyno operator was wrong