My vote goes ls1, that's awesome that the s54 is getting cheaper, just to make the purists happy, but for the money, I can't see why a motor that's expensive to maintain and modify is a good idea. If I'm going to dump money in, I'd rather do something that's going to give more performance and cheaper to maintain. Although, familiarity always helps with a decision like this, I know chevy motors a lot better than bmw's and the quirks of working on them.
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