Junk yards and Salvage

If shipping is not a problem try these guys Vander Haag's Des Moines, IA

 

Check with Northwest Casting Service:
Remanufactured Diesel Engine Components | Northwest Diesel Parts

Other side of the country but the price might make up for the shipping. I drove down and got three heads and con rods for my Cummins 855 last month

Impressive facility. Hillary is as nice in person as she is on the phone

 

Try
kt3406e@gmail.com
Guys got a great u tube channel builds cat engines

 

CAT heads are infamous for cracking. Odds are a used one will be cracked too. HHP makes a decent aftermarket one if you're tight on funds.

 

They have other places, Columbus Ohio is the closest to the op.

 

Arthur Trovei & sons might be able to help you. Port Jervis NY