I have weighed a few other SD parts vs regular 73 455 parts for general knowledge. Basically the the weight of the crankshaft and the block are statistically insignificant in difference. The bare blocks were SD-455 174.5 lbs. and the regular 455 was 175.35 lbs. The regular block did have freeze plugs in it and a dipstick tube. So really the same weight with all those strength enhancements. The crankshafts were SD-455 72.1 lbs. Regular 455 was 72.35 lbs. The cranks look virtually the same. Possibly a tiny bit more radius on the SD crank but it was ground .010-.010, so really can't say. No chamfer on the SD oil holes at all. Nothing special there. Going to begin reassembly soon.
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