Thread: Gen V 454 Head Help

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the mark 5/6 heads will work on the older 454 mark 4 block blocks s need the lower row of holes in the deck drilled some times there are one or two per side in the deck .there needs to be 3 just like the head gasket has .if a flepro race gasket like a 1037 it covered what on that small paper with head gaskets not many read.this needs to be done on the deck of block .there is many post on this on here. see this block in photo your deck needs the 3 holes by low set of head bolt holes in deck or your cooling may not work very good .used head gaskets to lay out holes needed to be drilled 1/2 hole is ok i start with a center punch then step drill up to 1/2