This part was removed from a 1965 Starcraft Suncruiser 20' w Mercruiser 150 HP GM 4.1L 250ci Inline 6 Dual Carb System w Kiekhaefer Mercruiser 1. 

This is a: Engine Block - This has some pistons stuck in it.  The block is good but will need some work and cleaning up before final use.  See photos.  No cracks.     

Stock No: 00G017-JB -  

I can strap this to a pallet for $40 and you can arrange your own freight shipping.  Local pick up is also available.