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I thought that the 2011 LMP1 engines were basically what LMP2 engines are, except the maximum cylinder limits were dropped to allow V10s and V12s, with a max of 2.0 turbo, 3.4 NA, 4.0 stock block NA, and 3.7 liter diesel.
LMP2 was intended to use stock block production engines of up to 3.2 turbocharged or 5.0 NA with an eight cylinder maximum.
But then again, this is the ACO, and they haven't even offcially published their 2011 regs yet(only the fourth draft of proposed regs has been made public), and who knows how IMSA will react to the ACO's rules, or the lack there of as now.
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