VBelt pulley layout

It's a 70-up (73 Duster and someone swapped in a 360, not sure when).
Part # on the waterpump is 2951571.
Pictures attached.

How free should this impeller spin when it's off the block? If I give it a finger twist it turns but stops almost immediately.

Thank you for help :)

View attachment 1715499586

View attachment 1715499589


ok so 70-up.

heres how it should be..

crank is 2 pulley if you have power steering. rear pulley goes crank, water pump and alt. front pulley power steering only. thats how it was set up from the factory. using a/c pulleys just causes a clusterfuck situation.


here are the pulleys ya need. no you don't have to buy them here. the pics are for reference. look at the measurements on them and then you will know what used pulleys to buy. also make sure you have the proper alt. bracket too..

70-up small block  crank pulley no air.png

70-up small block wp pulley no air.png