Based on the current rule set (which is subject to change at the behest of the ever-fickle ACO) the engines are:
P1:
3400cc normally aspirated (no cyl limit listed yet)
2000cc turbocharged
3700cc turbo diesel
there's no provision for production engines - you have to run them under the limits above
P2 (all production based, no tie-in to GT2 homologation):
5000cc 8cyl max normally aspirated
3200cc 6cyl max turbocharged (note: it is allowed to add turbocharging to non-turbo production engines if it meets the 3200cc/6 cyl limits)
-no diesel-
If Honda and Roush/Ford are committing strongly to the P2 class, then it may not be a bad idea to make that the premier class of the ALMS and only include the P1's for Sebring & Petit.
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