[Sizzler]

The SBC 400 has problems with steam pockets being created under the deck due to a lack of foresight in designing the cooling system passages. This problem can be alleviated by recognizing it and drilling holes to allow the steam to escape/not-form.

From what I've heard (no actual experience), the Ford siamese blocks do not have the type of pocketed areas that the SBC does, so it isn't an issue.