crank pulley 3769984 for a 440

This pulley is cast iron and is drilled for balance.
Ok to use on cast crank 440?

do you mean harmanic balancer

The cast crank 440 has a dedicated balancer, compare what you have to the pics in the link below.

http://www.440source.com/dampers.htm

Not a harmonic balancer. Pulley. I would think that it would be drilled to balance it. Just didnt want to put it on my cast crank engine and throw it off balance. I have the matching crank, water pump, and power steering pulleys. Don't know original application other than for a big block.

I know I have the right balancer.

A cast iron pulley? I've never seen anything like that for a passenger car engine. Maybe a big truck motor or something. Pass car engines use pulleys made from formed and folded sheet metal.

The crank pulley off my old cast-crank 440 was stamped as AndyF indicates. Still have it here (for sale), 4-belt pulley. Motor did have the weighted balancer (also here). No weights of any kind on this pulley.
Got a pic?

This pulley, along with the water pump pulley are cast iron. I know they came from a big block that was pulled from a 70s pickup. I will post pics tomorrow.

Here are a few post pics

Cast iron crank and wp pulley

Stamped steel and cast iron pulley comparison

Interesting; never seen that before.