1、Applicable Models: Belt pulley kit is replacement for Big Block 383 400 413 440 engine, bringing you professional use results. 2、Part Number: Belt drive pulley kit replace part number are 2258KIT, PC2258. Please double check the part number of your item to ensure perfect fit. 3、Functional Design: The uniquely designed outer lip of the alternator pulley can be used to keep the belt aligned. Grooves in the V belt of the crank pulley are designed to run power steering. 4、Precise Workmanship: The ratio of the water pump to the crankshaft pulley is 1:1, use with water pumps(not included) with up to a 5/8in shaft. 5、Slip Resistant: Builtin 1.5inch wide cogged belt, effectively prevents sliding, the flexible and tough design makes it easy to use.