Quote:
Originally Posted by pokeybritches
Many of the guys that build the highest horsepower cars prefer the M50/M52 iron block. The S52 and S54 don't have as much material, and the S54 can crack around the 700-800 whp mark if not sleeved (shops don't advertise this). A local shop owner has a 900 whp Z3 running the 2.8 (bored to 2.9 liter) built engine. I looked at trying to swap the M54 head onto the iron block for a high horsepower turbo, but the project was more ambitious (read: expensive) than I wanted to take on.
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You don't think that have more to do with availability and cost and not reliability? A M50 block is dirt cheap compared to a S54 block, both are cast iron after all. Several 1000+ hp S54's are runing in Sweden, but the M50's are more common but cost almost nothing. M50's are most bang for the buck no doubt.