If you were to upgrade a pre-mag to magnum heads, you would
> see more gains with a roller cam upgrade as well.
Be very careful in your selection of cams and mixing parts from pre-mags to
magnums and vise-versa.
Here's what my cam literature say's:
Chrysler began producing engines with hydraulic roller cams in 1985. These
early roller cam engines still used the shaft mount rocker arms and had oil
holes in the #2 and #4 bearing journal. In 1992 the new Magnum engine was
released using a stud mounted 1.6 rocker arm that oiled through the pushrod
and did not have holes drilled in the cam. There were also two different
styles of snouts on the cams, the longer snout (.950 from the first step)
accomodates a fuel pump eccentric and the upper timing gear while the
shorter snout (.650 from the first step) came in the fuel injected engines
that do not use a fuel pump eccentric. Using the wrong cam core WILL result
in engine failure.
Kuk
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