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FYI, the GM LSx series engines (LS1 - 345 HP, LS2 - 400 HP, LS6 - 405 HP, & LS7 - 505 HP) are all Small Block Chevy sized and weigh approximately 434 pounds complete (LS6 value). These are all aluminum engines and very recent designs. The oldest one in the list (LS1) came out in 1999, the LS7 is about a 3 year old design.
More HP, less weight, better fuel mileage than an MB engine.
This is my LS6, silver and blue since my 560SEC into which it's going is a silver car with a blue interior. This engine has a cam and some valve train work and has been measured at 410 RWHP, about 475 HP at the crank. It's about 1/4" wider than my M117 engine and 3/4" longer, and since the intake is on the front of the manifold, it's lower than the M117.
YMMV
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