The complete 283/327 type small block used to be about 580 lbs with bell housing and flywheel (which was perhaps some 40-50 lbs LESS than the old stovebolt sixes) and the 230 type six used to be about 100 lbs less equipped the same way. The 250 could be concievably maybe 20-25 lbs more due to the 6 extra counterweights. The 292 would be perhaps 25-50 lbs more than that due to taller block and even heavier counterweights. My guesses from various magazines = small block V8=580#
230 six=480#
250 six=500#
292 six=540#
235 six=620#
