89 360 vs 71 360
Roller blocks are a different casting. The lifter bore is taller, different geometry, and there is no relief for link bars. The OEM roller lifters did not use link bars, they use 'dog bone' retainers with a 'spider' hold-down. You can see them in the picture below. The 'spider' is what is held down by the three bolts in the cneter of the valley, and the 'dogbones' are what the 'fingers' are holding down. They have a 'double-d' shape which matches the lifter body and prevents the lifters from rotating. Using a roller block with 'retrofit' rollers can be a challenge, because the taller lifter bores may interfere with *some* link-bars.
What you want are solid lifters which are advertised as compatible with a magnum engine. There are several out there, but they tend to be small (.750) roller diameters. I have not seen anything advertised as magnum-compatible AND with a larger (.800+) roller. You'll have to contact the lifter manufacturers to find out if their link bars will clear a magnum block.
Roller blocks are a different casting. The lifter bore is taller, different geometry, and there is no relief for link bars. The OEM roller lifters did not use link bars, they use 'dog bone' retainers with a 'spider' hold-down. You can see them in the picture below. The 'spider' is what is held down by the three bolts in the cneter of the valley, and the 'dogbones' are what the 'fingers' are holding down. They have a 'double-d' shape which matches the lifter body and prevents the lifters from rotating. Using a roller block with 'retrofit' rollers can be a challenge, because the taller lifter bores may interfere with *some* link-bars.
What you want are solid lifters which are advertised as compatible with a magnum engine. There are several out there, but they tend to be small (.750) roller diameters. I have not seen anything advertised as magnum-compatible AND with a larger (.800+) roller. You'll have to contact the lifter manufacturers to find out if their link bars will clear a magnum block.