Sbm x block

I am not sure about the R blocks, but on some stock blocks where the Comp 828s need grinding in the valley to go in, the Crane rollers will slip right in. My oldest son has my $800 set of Cranes in his motor because when he swapped to solid roller from hyd. flat his comps wouldn't go in without grinding and my Cranes did. We did the swap over a weekend and it is his only car so it had to be running for him to go to work monday. Any how, maybe the Cranes would work better in the R blocks.