Originally posted by AmericanMuscle1
i was just wondering how they determine the size of blowers? i know theres 671 871 1071 1271 and 1471 blowers but how are they sized and i also heard that you can boost your psi bu changing your pully sizes....what would be a good blower for a 454
the size is determined by the amount of air it can pump. the bigger the blower the more air it will move. the 4 and 6-71 blowers was built to pump enought air to run a 4 or 6 cylinder motor with 71 cu. in. per cylinder. so say a 6 x 71 = 426 cu. in. or 8 x 71= 568 cu. in. you increase or decrease the amount of boost with the size of the pulley. you need the bigger blowers when you get into the higher rpms