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Message: <blockquote data-quote="fabianyee" data-source="post: 444381" data-attributes="member: 6">M50 uses cast iron block which is much more durable than the lighter alloy block used for the M52... And if u are putting in the M52, make sure u have the undertray splash guard in place to prevent water from being splashed from underneath onto the alloy block engine.. Sudden temperature change can warp or crack the aluminum alloy block.... Actually in term of mod potential, the M50 with the less restrictive OBD1 is better... FYI, read in a BMW magazine a couple years back that all AC Schnitzer inline 6 engines used the cast iron block of the M50 for all its bored and stroked engines in favour of the aluminum alloy blocks...</blockquote>