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I looked into this myself, and could not justify it. Easiest way is a 400 SBC piston (4.125 bore) and SBC rod. Offset grind the crank to 3.510 or use the Eagle Honda journal rod and go 1.890 for a stroke of 3.62. But, even in the latter case, you are not even gaining a 1/4" of stroke. You do however have a much wider choice of rods and pistons available. But like Joe stated, a 455 really is a "factory stroker". The cost of offset grinding $400, $1500 for pistons, rods, rings, and bearings, $250 balancing, the extra boring cost, and you are already at the cost of a 455 build complete with head work.
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