Zetec Lightweight Aluminium Under Drive Bottom Pulley (Z064)

Zetec lightweight aluminum underdrive bottom pulley.
For use on Silver Top, Black Top and ST170 engines.
Improves engine acceleration.
This pulley weighs 0.43 kg & 115mm in diameter.
Std item weighs 1.43 kg & 132mm in diameter.
Anodized in a grey finish.
Helps combat water cavitation in high revving engines by reducing water pump speed by 13%.
If using the front plastic timing cover requires trimming.
Also requires a shorter belt