My KB 4.5" bore street hemi block was 140 lbs. if I recall correctly. I also have a cast iron World block. Came at 4.25" bore, but I bored it out to 4.5"...probably took 30 lbs out of it, lol. Holy crap is it heavy. Never weighed it, don't want to break my scale. 
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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