but i believe you will find that there is not a lot of difference in the weights. the first two have iron blocks, the third is al. i think that mb took a lot of trouble to make the egines very similar in weights so that handling is always about the same regardless of engine installed.... within reason.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.