Well, I think I've done it again... I went out and bought some Comp Cams Pro Magnum Roller Rockers off a guy on Ebay. He initially listed them as the hi-tech stainless ones (in which self aligning and non self aligning is not specified), but they turned out to be pro magnum's instead. ANYWAY, the pro magnums turned out to be of the NON self aligning variety. I have an 89 Jimmy with 350TBI. Can somebody tell me if this motor has self aligning rocker arms and if so, can they be converted to non self aligning rocker arms?