I have many Pontiac Water pump used cores with cast impellers. Good to rebuild.
Most are 11 bolt ,but have some 8 bolt and maybe 1 or two 4 bolt.
Email me and let me know if you are looking for specific part number and date code range.
Prices are $60.-$125. + shipping, depending on part number.
thepontiacman@yahoo.com
518040 10 C/ 12C 4 bolt
9772718 GM2
9782482 GM2
9782482 C297
9796351 D299 / E070
9799124 G309/L109
488296
488298
*also have some with steel impellers if interested.
Many other parts available. Email me