Originally Posted by RingMeister01
I believe the use of the S62 is due to the availability and cost advantage of using a mass produced engine block. Remember the S62 is based on the M62.
No that has no bearing on the situation (pun intended?).
First off the S62 block casting is different from the M62. It is stronger and also has larger bores (though these engines are likely bored and sleeved anway).
Secondly, these race engines are big bucks any way you slice it and the cost to source a block is absolutely minuscule in the grand scheme. They will use whatever works best and is legal.