The engine and transmission weigh about 800 pounds I think. There is some sag in the springs because of that, so you will need to jack up an inch or two to remove that load before the engine actually lifts up with respect to the chassis.

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James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
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1987 300SDL junker 170k
1982 300SD junker, 265k