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Unlike older Ford V-8 blocks, the Modular blocks feature this rear-main seal retainer. "This positively locates the seal and helps prevent premature leaks," says Bob Oster of B&B Performance Machine. Also, notice the Cobra steel crank that was used in this B&B buildup. "All 4.6 cranks are interchangeable, however, some machining is necessary due to clearance problems between the crank counterweights and the main webbing on some blocks," added Oster.