Pulley weight savings

I don’t have a set of original 302 Camaro pulleys to compare to, but I suspect I’ll be able to save a bit of weight with an aftermarket set.  Purchased the kit from March Performance.  It is reasonably priced, made of billet aluminum instead of chrome, and has deep grooves for the v-belts.  These cars have a reputation for “throwing” belts at high rpm, and the deeper pulley grooves help this.

March also has a ton of wacky serpentine conversion kits to move it all to a modern single-belt system, but alas, this would not be legal.

Only have the alternator pulley for comparison.  I guess technically this is a generator since it has an external voltage regulator, but anyway, the stock one-

Felt heavier than it looked.  Probably some kind of plated steel.

March billet aluminum equivalent:

7.45 ounce difference – almost half a pound!  Pretty significant for a pulley only about 2.5″ in diameter.  Besides being up high and forward of the front wheels, this thing also turns much faster than engine speed, due to the diameter difference from the crank pulley.  So three wins on the weight side for this pulley.  Will be using the March pulleys for the remaining pieces – crank pulley (2-belt), water pump pulley, and power steering pulley.  Since the other pulleys are all larger than this, I suspect this will add up to several pounds of rotating weight off the nose, a great help!