Re: [Chrysler300] Cams, ram manifolds and stuff.

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

Karl,
It all depends on the specifications of the "performance" cam selected.
Most "performance" cams have longer duration (valve open time expressed in 
crankshaft degrees of rotation) than stock factory cams. This accounts for 
their rough idle, loss on low rpm power, and lack of intake manifold vacuum. 
The cam supplied in your long ram engine had a rated duration in the 260 
degree range. The cams supplied with the short rams were in the 292 degree 
range. The longer duration enhanced the ram effect at the higher operating 
ranges of the short rams. The lift at the valves was similar for both cams. 
What you need for improving your long ram motor is a cam with about the same 
duration, but with more valve lift. Opening the door (valves) further will 
improve cylinder filling at the rpm range in which the long rams work well 
without the undesirable side effects that longer durations impose. Going 
from .440" to .540" lift will certainly wake the engine up. Contact any 
reputable cam grinder (Isky, Comp Cams, Crane, etc.) and they should be able 
to help you select a cam and also what other changes you may need to make to 
accomodate the increased lift.
Larry Johnson


> From: "Magik Draggin'" <longrammopar@xxxx>
> To: Chrysler300@xxxxxxxxxxxxxxx
> Subject: [Chrysler300] Cams, ram manifolds and stuff.
> Date: Sat, 22 Sep 2001 23:13:36 -0500
>
> I have heard that the addition of a performance cam in a long-ram 300 (such
> as my "G") would be more of a detriment to overall performance than a help.
>
> If this is the case, what of the so-called "short rams" of the later 300's
> and would the same problem persist if a HP cam were installed in one of
> those vehicles also?
>
> And finally, were there any 300's ever made with 440's and any sort of
> short, long, or cross ram manifolding?
>
> Karl
>
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