Maybe it is a 4.490 bore. That way you can hone to 4.500. I do like the aluminum blocks. There are new iron Callies blocks on ebay now for $4,900.

https://www.ebay.com/itm/Gen-II-426-Hemi-Block-4-25-Inch-Unfinished-bore-at-4-245/333907434360?hash=item4dbe6f1b78:g:JDsAAOSwvtNgCIGZ

Hemi blocks are 17 head bolts. 13 regular bolts and 4 inner valley studs.


2011 Drag Pak Challenger