Re: [Chrysler300] 500 ci

["Don Verity" <d.verity@xxxx>]

I will be using the short ram, header set-up on the 440 when the F goes back
together again. I'll be testing the engine on a dyno before it goes in the
car too and am not going to change the cam yet, so I'll let you know how it
goes! I am also going to try and have someone make the heat tubes for the
headers. I will also post again on how that comes out too. The headers that
I got years ago had the elbow flanges still on them. I was surprised to find
that the short elbow pipe had a piece that protruded into the exhaust flow
by about 1 1/2 inches. It was just an extension of the outer pipe with half
cut away. It was most likely to direct flow into the pipe and up to the carb
base. It sure looked like it would reduce exhaust flow in that cylinder
though, and I won't be putting that back in.
300ly,
Don
----- Original Message -----
From: Laurence G. Johnson <laurence_g_johnson@xxxx>
To: <d.verity@xxxx>; <dan300f@xxxx>; <zincspot@xxxx>
Cc: <Chrysler300@xxxxxxxxxxxxxxx>
Sent: Thursday, November 21, 2002 9:13 PM
Subject: Re: [Chrysler300] 500 ci


> All,
> I looked up the specs for the 440 mag cam:
> Intake opens: 19º BTC
> Intake closes: 69º ABC
> Intake duration: 268º
> Intake lift: 0.458"
> Exhaust opens: 77º BBC
> Exhaust closes: 27º ATC
> Exhaust duration: 284º
> Exhaust lift: 0.450"
> Overlap: 46º
>
> Note that the intake duration is 268 degrees, same as the ram cam. The
> exhaust has more duration at 284 degrees. The impact on the ram setup
would
> be the overlap. The ram cam is probably less than the 46 degrees the Mag
> cam is rated at. It would be interesting to see the specs for the ram cam
> (with the 4º retard figured in) side by side with the 440 Mag cam to see
how
> close (or different) they really are.
>
> The 440 Mag was rated at 375 horsepower @ 5200RPM and 495 lb-ft torque @
> 3600RPM. On paper, at least, the short ram version looks like a better
> candidate for this displacement/cam combination, since the peak torque RPM
> coincide better than it does with the long (2800RPM) version. Has anyone
> tries the short version on a 440 Mag? It should be able to produce enough
> torque to twist axles off cleanly right at the flanges.
>
> The real trick to getting the long version to work correctly is to find a
> cam that produces peak torque right around the 2800RPM resonant point for
> the cylinder head/displacement combination. The rules of thumb are: As
> displacement goes up the peak torque RPM goes down. As the heads flow
better
> the peak torque RPM goes back up. The 906 heads flow significantly better
> that the 1960-1962 heads and the 440 has 27 extra inches over a 413 and 57
> more than a 383 so the matching cam now becomes a question mark. The long
> version seem to be very sensitive to the matchup and Chrysler did an
> excellent job in designing a cam that worked well in either the 383 or
413.
>
> The short version doesn't seem to be nearly as sensitive. The 400 and 405
> horsepower versions used cams with 292 or 308 degrees duration and made
lots
> of power.(Remember the famous 62 Chrysler that Hot Rod magazine featured
in
> 1962?) Maybe your friendly neighborhood cam grinder could suggest a grind
> for a ram induction 440 Mag that would out perform even the Chrysler
design.