This pulley is made from billet 6061-t6 air craft quality aluminum.
This pulley is NOT an over drive pulley. It is the same diameter as the stock pulley.We did this because of all of the complaints of the other water pump pulleys being overdrive style (smaller diameter) which causes you to have to go to a smaller serpentine belt so the factory tensioner will function propely. It is designed to reduce rotational weight of the engine and as a cosmetic dress up piece.