Quote:
Originally Posted by kyleb350
I think you may be right. The original post makes a couple references to the "production engine". I'm going to take a guess and say it's based on the S63 and destroked from 4.4 to 4.0 liters.
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That's exactly it, yes. The engine specs are in the OP. The race engine (P63B40? I'd guess that's the name of it since M6 GTLM motor is the P63B44) has the same 89mm bore as the production S63 and N63. However, instead of the 88.3mm stroke of those engines, it uses a shorter 80mm stroke which brings displacement down to 4.0L. Note, furthermore, that the specs show a 98mm bore center which is also the same as the S63/N63, and, in fact, has been used consistently for every BMW V8 from the original M60 which was released back in the 1980's.