Quote:

That line is 4.180 and you may not run this on a 4.180 bore.
This can be done by hand to run on large bore but makes head "fit" more Applications.



Not to mention not all bores are the same place in the block. This way if you have a block with some core shift you can move the bore around a little and then match the chamber to it.

Free advice and worth every penny...
Factory trained Slinky rewinder.........