1、Fitment: The long water pump is replacement for Chevy SB 1958 to 1995 283 327 350 383 400 V8 Engines, please confirm whether your model is applicable before buying. 2、Premium Aluminum Pump: This pump will flow up more coolant than ordinary water pump, it will be better than ordinary oem cast iron pump heat dissipation, also lighter. 3、Excellent Performance: The pump features premium roller bearings, custom heavy duty impellers that maximize water flow and reduce cavitation at high rotational speeds. 4、Durable: The sealing parts of water pump are made of premium materials, which have a long service life, can resist high temperature, and ensure that the engine always maintains a suitable temperature when working. 5、Size: The long water pump has 5/8 inch pilot, 1/2 inch NPT side port. And the pulley flange is double bolt mode. Please check the data carefully before buying.