The spacer will not hurt your performance but will help. Your 4 hole spacer builds torque on the bottom end by increasing the velocity at low rpms which gives you a stronger fuel signal.
An open spacer without holes will hurt you a little bit on the bottom end but it will help at high rpm. If you are running a stock or near stock motor you should always run a 4 hole spacer.
Spacers insulate the carb from heat and they also straighten out your fuel flow from the carb to the intake valve.
Lee
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