I think hydroformed scattershields are a better proposition and not
that expensive, but if you want the cast kind read this:


http://www.lindsaybks.com/bks7/chas1/index.html



Wilcap used to do these but since Tony is no more the have got kind of
spoiled.

http://www.wilcap.com/webdoc7.htm

"In the late sixties Tony began looking at fuel economy. Like most
things he did, he studied extensively and came to the conclusion that
the answer lay in the diesel engine. By 1974 he was busy doing diesel
engine swaps into Dodge Darts and Ford Pintos. The big Dodge got 42+
mpg and the Pinto achieved 50 mpg. Another conversion was to the Dodge
and Chevy 1/2 ton trucks. Now, looking back, I wonder how much longer
would the Pinto model been around if the fuel tank was filled with
safer diesel fuel and would Chrysler have been in better financial
shape in 1980 if they began putting diesel motors in their light trucks
in 1970. One of my favorite stories from that period was about how he
and the crew from Wilcap went to a ASE meeting on fuel economy. They
sat and listened to the speaker talk all about the glories and promise
of the hydrogen/gas hybrid powered car. The engineer spoke about the
great potential and envisioned that after 10 years, may slightly more,
of work and millions of tax payer dollars they could have a car that
might get 35 mpg. The three of them had driven diesel powered cars to
the meeting and the worst of them got 50 mpg."