Re: [Chrysler300] alum head or not

["Laurence G. Johnson" <laurence_g_johnson@xxxx>]

Greentruck,
I think your basic question is whether there is a significant performance 
gain in using a current aftermarket cylinder head on your ram-K over the 
original head, and if the improved port design and higher airflow capability 
of the newer designs would be of benefit. In a nutshell, the answer is no. 
The old ram castings are very restrictive with their long dimensions and 
small port cross sectional area. They effectively choke the airflow off in a 
413 above about 4500RPM. Bigger heads will not overcome this. The original 
package was well engineered and optimized by Chrysler and, therefore, very 
difficult to improve upon.

If you want more power, switch to a new design intake along with the 
cylinder heads. The November 2002 issue of Mopar performance magazine ran an 
in depth dyno study on eleven current big block Chrysler intakes and 
contains much information that I'm sure you would find helpful. Several of 
the manifolds produced high horsepower numbers because they flowed adequate 
air to keep up with the heads. Good luck.
Larry Johnson








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> Subject: [Chrysler300] alum head or not
> Date: Fri, 7 Feb 2003 20:52:37 EST
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> Sorry for not being clearer, I am going to use the rams on the K. Which is
> the reason for having to use the ram cam. Sorry
>
>
> [Non-text portions of this message have been removed]


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