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I don't know the exact weight but I know for sure that a bare 300 block weighs a LOT more than a bare 302 block. I can pick up a 302 block and put it in the back of my truck without too much trouble, the 300 just about killed me.
not to dis agree w/ 600 but ive also read that the 300 wieghs 480... but i duno if thats long block, short, or complete w/ everything .. just my 2 cents.