I ask because I have a factory block that the bottom end is cross bolted and just like a Hemi but it is wedge top end. It has never been used , still at 4.25 bore. The consensus of the people I have asked and talked to is that it is an ex factory cast nascar block. I am going to build a stroker out of it 4.50 stroke crank. I am going to put it my challenger for drag week. And was just wondering how much more this bottom end will take over the standard 2 bolt main block