| This belt is recommended for 240's that are using our HO alts and the stock 240 crank pulley. If you're using a 280 z or zx pulley then use a belt for that model. The stock 240 belt won't last when using our HO alts. The stock alternators use a shallow V design and the stock belts are designed for that type of pulley only. Our HO alts use a deep V pulley and it will crush the spine on a stock application belt, even the factory Nissan belts. When using our HO alternators you MUST keep the belt a little towards the tight side at all times. Otherwise the belt may start slipping. If it starts slipping too much, it will get overheated and ruin the belt. last updated 04/12 | 
