Re: [Chrysler300] Replacing Heads & Gasket Sealer

["Gary Barker" <gbarker@xxxxxxxxxxxx>]

I cc the heads on all Mopar engines I build.   Different customers want 
different ratios plus if you don't you won't get the best performance.  As a 
rule of thumb.  for every .020" that you remove either buy using different 
thickness gaskets or milling the head or block changes your compression 
about  0 .5 %  so if you have 10:1 and you add .020" thicker gasket , you 
will have 9.5:1 compression.  I try to take them to the tenth when custom 
building a engine.                          Just a Little info.   Gary 
Barker


From: <mwl1967@xxxxxxx>
Sent: Monday, January 28, 2008 6:15 PM
To: <mplindahl@xxxxxxxxxxxxx>; <richard@xxxxxxxxxxxx>; 
<chrysler300@xxxxxxxxxxxxxxx>
Subject: Re: [Chrysler300] Replacing Heads & Gasket Sealer

>
> In a message dated 1/28/2008 1:02:18 PM US Mountain Standard Time,
> mplindahl@xxxxxxxxxxxxx writes:
>
> FYI, I  am using the newer style, open-chamber heads that I was told are
> desirable  for the gas these days.
> The head surface was machined to guarantee  flatness
>
>
> Years ago when I built the 413 for my 300K I scoffed a pair of recently
> rebuilt heads off of a 440 that was to be a race engine. The problem, I 
> later
> found out was that the compression was lowered way too much in changing 
> from a
> closed-chamber head with steel shim gaskets to an open chamber head with
> composite gaskets.
>
> Although the car essentially runs fine, crossrams and all, it has never 
> had
> the guts to really pull the car hard. ( just ask don Cole LOL ) Later
> calculations indicated that the compression was dropped from around 9.5:1 
> down  to
> around 8:1 with a corresponding loss of torque and HP. Several experts 
> have
> told me I killed a minimum of 50hp. The bright side of the picture is that 
> the
> car runs all day long on 87 octane garbage with nary a hint of detonation.
>
> When this 16 year old engine gets redone again I'll be going back to the
> closed chamber heads. If you must use the open chamber heads you already 
> have
> please consider using the oem style steel shim gaskets so as to mitigate
> compression loss.
>
> Mike Laiserin
> Phoenix, AZ
>
>
>
> **************Start the year off right.  Easy ways to stay in shape.
> http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489
>
>
> [Non-text portions of this message have been removed]
>
>
>
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