Mel, I have an old 50's Hop Up magazine that states on all the early hemi
engines you can "only" safely do 65 thou of head milling. I have milled a 55
Dodge head 45 thou and did not have to resurface the intake, but to be safe I
used a the thicker composite gaskets not the shim type for both the heads and
the intake surfaces. With the age of these parts I would personally stay in
that 40 thou range. On this particular engine I reasoned that the milling and
cam grinding would equal out and used the stock push rods, it worked
excellent. Tim
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