Standard 4.25" bore, 4 bolt main, 454 bare block w/main caps. It is a "289" casting, date coded 1972 "CE" block with the High-Performance casting markings everywhere. These early blocks are rare, high in nickel/tin, and the cylinder walls are often thick enough to take a .125" overbore without issues. This block has so little wear that the bore could be crosshatched and re-ringed with standard size pistons if you wanted. Beware of newer blocks for the '80's because they have thin cylinder walls and very little nickel or tin. This block has 4 bolt main caps for maximum bottom end strength. Perfect for that drag racer or offroad truck who doesn't want to worry about breaking anything. I don't think it can be shipped because UPS's weight limit is 150LBS. I can't crate-freight it because of my bad knees either. So pickup is a must. I might be able to deliver it for a fee+gas within 100-200 miles (email). All holes have been chased and cleaned with a tap. The block has been cleaned/mag'd and deburing has be done to the water passages and oil return areas too. I had block to build a 496 stroker project. However I have been recently married and paying the bills is more important than this engine block is right now. $500 FIRM or I might consider a trade for some aftermarket SBC heads with the exhaust crossover. Thanks guys!!