There is a reason Metric Motors costs more, they probably do a better rebuild.

Will the Adsitco motor run better then a 20 year old engine you yank from a junked car? Probably. Will it run as well and last as long as a Metric rebuild? Probably not.

The queston is what is the difference? I'd like to see a list from both places of what they do.

There is a world of difference between a ring job, new bearings, and new valve seals. Or new pistons, all new valve's, new sleeves, ect.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200