Re: [Chrysler300] Replacing Heads & Gasket Sealer

[mwl1967@xxxxxxx]

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.     
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