1、Applicable Model: Water neck is replacement for Small Block Big Block 283 302 305 327 350 383 396 427 454 502, please confirm whether your model is applicable before buying. 2、OE Number: The part number of water neck thermostat housing for reference is 8457BK, please confirm whether it is consistent with the OE you need. 3、Engine Temperature Control: The water neck thermostat housing is mainly used to control the temperature of the engine, which improves engine performance. 4、Seal Mounting: The thermostat housing is equipped with a rubber seal ring to provide a seal mounting. Easy to operate, perfect match with the original car. 5、Direct Replace: Designed and manufactured according to the original sizes, can be used to refurbish and replace the old and broken water neck.