Sbm x block

B3422w5 said

The X block is identical to a factory 340 block in the lifter valley area.
I had zero problem dropping in a set of Crane ultra pro’s in an X block i ran.
Where you run into problems is with R3 59 degree stuff with the head bolt bosses.
Brian at IMM worked with Comp to come up with a fix for that. I forget the part number, but i remember it being a huge help

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I do believe the restoration block is identical on the lifter valley side but it is not identical on the water jacket side.
As the other poster said, when Chrysler released this block they specifically said no roller cam because there was an interference problem that could not be rectified by grinding like standard blocks.
That's when the link bar was moved I believe.