Suit small block Chev with long water pump Includes 390L150 belt and bolts Our alternator pulley is steel, as the alternator is normally used to tension the belt. Crank and water pump pulleys are billet aluminium. Steel Alternator PulleyUnlike alloy alternatives, our alternator pulley is manufactured from steel for durability and proper belt tensioning. As the alternator is typically used to tension the belt, strength and rigidity are critical — and steel delivers. Billet Aluminium Crank & Water Pump PulleysPrecision-machined from high-grade billet aluminium for reduced rotational mass without compromising strength. Designed for true alignment and smooth operation. Positive Drive Gilmer SystemThe 390L150 belt ensures secure engagement with minimal slippage — ideal for high-load environments where reliability matters.
