detroit 671 back pulley

[micky]

I need the pulley that goes on the back of the 671n engine. The one that's use for the alternator belt. Where can I get one or anybody knows the part number? Thanks

 

[bostonhatteras]

Use your engines serial number stamped on the block side around the block drain. Call a good detroit dealer, give them the number and they will be able to find out everything that engine was built with.