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Don't want to highjack this post but I have a couple of questions. Does the R1 require less grinding to use roller lifters than a R3 and is the R1 a better block than the X block? Again, intended use is a W2 head engine.



If anything I'd say an R1 would require maybe hair more clearancing work than an R3 for roller link bars/rivets.

R block.. they are drop in deal, as R block does not have inner row of head bolt bosses, lifter valley is like factory block/X block.

For all intensive purposes an R1 might as well be an X block other than the 18 bolt capability & I think they have slightly thicker deck, that's about it.