So I have both a 1972 and a 1978 360 engines. Were the cyl. heads 'Lightened' along with the block during AMCs weight loss period ? Haven't had these apart yet - what if any are the differences ? Any known problems with the later 360s vs the '72 ? I'd read that the weight of the early V8 is 600lbs vs 540 of the later version. Is a '72 the same as a '78 in weight ? Brien. NEW YORK eagle registry #501 eagle kammback registry