The "54mm" roller bearings are really 2.125" INA roller bearings. Ford sells them for their BBF engines. My Hemi block had #1-4 cam bores cut to 2.500". I think most of the SS Hemi guys run all five. For some reason, Joe Allread did my block for the front four and left the #5 as standard. Here is the Ford bearing kit. Pretty good deal compared to buying them individually at the bearing house.
https://www.summitracing.com/parts/...Cld-R6QIVUtbACh2thw3QEAQYASABEgJWffD_BwEJegs has them for the same price.
Bearing house price.
https://www.motionindustries.com/productDetail.jsp?sku=02852350
