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      09-26-2013, 08:54 AM   #29
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NISFAN's Avatar
United Kingdom

Drives: The best kind of F30 :)
Join Date: Aug 2012
Location: Bedford UK

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Comparing the two pics in the previous page, and crudely measuring the various components, it is certain that the bore size is bigger than N55. The strange thing is that block height is also bigger on S55. Block height is typically linked to stroke length (yes block height can be stretched to obtain a long rod to stroke ratio, but unless the ratio was way out on the comparable engine, a smaller stroke would alter this any way).

My money is on this being a bigger displacement than 3litres.