Yes, it means only OEM heads as cast.In the all motor class, for LS powered cars, it says:
Cylinder Heads: Un-ported as cast heads only, porting prohibited. Any valve job, no milling of cylinder head. OEM heads only are permitted with the following casting numbers: 241, 243, 317, 706, 799, 821, 823, 853, 862, 5364, 8452.
No does this mean only OEM heads, or can you also run a say PRC or Trickflow As Cast style head?
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