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The rod journals of the 331/354 measure 2.250 inches, which happens to be extremely close to the Pontiac 389’s 2.2497 rod journal. The rod saddles of the 331/354 measure 2.3755 inches while the 389’s are 2.3750 inches. With a minor resizing of the Hemi rods and the addition of new lock-tang notches, the 389 bearings fit perfectly in the small Hemi rods. The difference in crank-journal diameter is easily corrected by polishing the journals down to the proper spec. The rods of the 392 accept 440 rod bearings with only the addition of new lock-tang notches. View Related Article
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