Bob Palmer wrote:
>
> Chris,
>
> (snip) I have heard it said that the HiPo block was a hi-nickel
> alloy or high nodular iron. I don't believe this is true. For sure, the main
> caps are bigger, high-nodular iron, but they could be transferred to a
> non-HiPo motor and I know of some instances where this has been done.
Bob,
More from Tom Monroe, for those who do not have the book. (Recommended
reading - go buy one!)
I believe the statement is usually made that the CRANKSHAFT was "high
nodular iron". This is in Tom's book, and is correct. If you note, he
states that the last counterweight may be polished for Brinell hardness
testing (small indentations) and the letter "K" stamped next to the test
counterweight. This is the story I related.
However, I added "how" Ford made the HiPo to be high nodular iron. How
this is done was revealed to my by a Ford motor plant manufacturing
engineer I met after he changed jobs into the Rocket Biz. By selective
testing of standard cranks. Each heat-treat "could" end up with higher
nodularity. They could very well have made a special heat treat run of
a batch of stock cranks, and kept those that passed the hardness
criteria for the HiPo. He did not say, one way or the other, and
unfortunately I did not ask. There is NOT a difference in the material,
or process, other than the heat treat to get the nodularity. They were
tested to see if it succeeded.
Let us also not forget the rods of the HiPo, which used 3/8 bolts, but
the rods are broached, like the standard rod, but to accommodate the
head. The BOSS rod, while using the larger 3/8 bolts, was spot faced for
clearance, instead, and is stronger. The HiPo rod had it's own part
number (C3OZ-6200C), but was replaced by the Boss rod for "service use"
C9ZZ-6200-B. Both are very dear now, in any event.
Of course the heads were different, as well as the cam, as most know,
and the smaller front timing chain and counterweights inside the cover.
IMHO, if one does not have a HiPo engine, it really does not make a lot
of sense to spend a lot of money getting one, unless you have a "K"
Mustang. It never was Tiger stock, and there are lot's of less
expensive, and more reliable ways of getting a modified engine that
exceeds that horsepower, as authenticity is not really a factor.
--
Steve Laifman < Find out what is most >
B9472289 < important in your life >
< and don't let it get away!>
<SLaifman@SoCal.RR.com>
<http://www.TigersUnited.com/gallery/SteveLaifman.asp>
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