New billet aluminum water pump pulley for Datsun 240Z-260Z-280Z and 280ZX. Pulley is available with two different belt widths which we will call thinner and thicker, basically 3/8" wide or 1/2" wide belts. The idea is to get all of your pulleys to have matching belt widths for best performance.
Thinner pulley groove= .380" at the top of the "V". uses 3/8" or 10mm wide belts.
Thicker pulley groove= .440" at the top of the "V", uses up to 1/2" wide belts.
Most of the new balancers and alternators are using the thinner (3/8") belt.
*Pulleys include a thin spacer as we have found that the pulley might rub on some brands of water pumps.

