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What I can think of being heavier: block, crank, rods, pistons, intake, distributor. Some of that is only by ounces, so my GUESS is 20-30 lbs. I think AndyF has some info on relative weights in his book, but IIRC some of the motors he weighed had aluminum heads & whatnot.



Yeah, according to AndyF, "as much as 40 pounds less" when talking about a complete engine.