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4.6L 1991-00 BORE 3.552 STROKE 3.5433 5.4L 1997-00 BORE 3.552 STROKE 4.165 Bore spacing is 3.9370 in both. Main journal is 2.6572 dia in both. Rod journals are 2.0863 in both. Rod length:5.9331 4.6, 5.4 6.6575. Hope this helps.