Well I finally brought my cars down to be weighed. Both cars were cleaned out and weighed without a hard top. The hard top weight is unknown at this point. Both cars are fully operational and weight of additional 10 Lb, for condenser and RD and Freon was added to the M120 560SL since it will be added later.

Both cars were weighed with ~ 1/2 tank and estimated weight of gas was subtracted.

Stock 1988 560SL. = 3472 LB
1986 560SL with M120 Engine and 722.6 Transmission installed = 3770.5

So the addition of the M120 engine and 722.6 Transmission cost 298.5Lb.

The engine and trans by themselves account for 174 Lb additional. Subframe modifications account for 17 Lb. The additional 108 LB is probably mostly due to larger wheels tires and breaks from the SL600 and rear subframe mods as well as other small unaccounted for brackets and weldments.

Unfortunately I wont know the hard top weights until the winter when I take them down. But it looks like the car is coming in at around 3850 LB.

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To see my 129 parts for sale visit:
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John Roncallo