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There is no significant advantage other than less peak twisting stress over the entire length the crankshaft. The firing orders are 1-3-7-2-6-5-4-8 for the 351W and HO 302 motors vs. 1-5-4-2-6-3-7-8 for early 289 and 302 Windsor motors. Connecting rods 1 and 5, 2 and 6, 3 and 7, and 4 and 8 share the same crank journals. Looking at the firing order the early 289/302's fired 1 and 5 at the very front of the crank in order. This placed torque stresses from two cylinders in power stroke on the very front throw of the crank at the end furtherest away from the load of the crank. The later HO and 351W firing order places common power strokes further back in the crank, reducing peak twisting stresses over the length of the crank.
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