mopar performance ONLY! DO NOT GO WITH 440 SOURCE. buck up the extra coin and get the mopar unit. they are a better casting. the 440 source unit has restrictive casting.
CRAP!!!! I read a post on a forum a while ago where a member took time out to test the big block pumps... There was NO RESTRICTION to water flow with the cheaper alloy housings, when based on what the max output of the waterpump was..