It may go without saying, but I would certainly spin the pulley on both it and the water pump to confirm which is making the noise.

These are amazingly effective(O'reilly is not the only source):
https://www.oreillyauto.com/detail/...performance-tool-stethoscope/pfm0/w80582

Last edited by ascwrangler1; 10/25/2023 5:25 PM.

1958 3100 Fleetside w/235 4spd