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FWIW, A 360 can be internally balanced without Mallory Metal if you use light rods (like Eagle/Scat I beam) and light pistons (like SRP flattops).

I've got a 360 cast steel Eagle crank, but it's already been drilled for lighter rods & pistons. But Eagle advertises it as having a "typical" weight of 55 lbs. Their 360 forged steel version is advertised as having a "typical weight" of 59lbs.