When removing the stock
air pump (for racing), it's a good idea to run a double-sheave alternator
pulley. The single belt that is left after removing the air pump and air
pump belt is sometimes not enough tension on the waterpump. What
eventually happens is you get a loud, screeching sound that's produced by the
single alternator belt slipping against the waterpump.
Racing Beat makes
a slighty underdriven, double-sheave alternator pulley that fixes this
problem. Alternator RPM is reduced about 20% from stock.
and installation of the alternator pulley almost necessitates the use of an air
impact gun to remove the large nut that holds the pulley onto the alternator
shaft. Reinstallation of aftermarket alternator pulley may or may not be
able to use the lock washer that is originally used on the stock OEM alternator
pulley - if you cannot fit the lock washer on the aftermarket alternator pulley,
leave it off. Make sure to reuse the air impact gun to torque the large
nut back onto the alternator shaft.