Re: {Chrysler 300} 56 300B 355hp

["'John Lazenby' via Chrysler 300 Club International" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>]

The document from Chrysler states a higher compression and different cylinder head part number but no mention of different exhaust.  The 9.0:1 reading below is incorrect based once again on the document which states 9.25:1 and the optional head is 10.0:1.

I think where some of the confusion on this comes into play is the race cars used the Dodge truck 4 bolt exhaust manifolds.  Those sometimes are referred to as the NASCAR exhaust manifolds.  

When restoring our 300B I found a pair of NOS examples and they are on the car today.  They are set up to accept a 2.5" exhaust system.  If you look at some detail shots of the "race cars" you can actually see these and in some cases they were actually  in the trunk area and exit above where the bumper would be located.  I also believe these car ran no mufflers of any kind which makes perfect sense for "race cars".

I had a system custom built for our car following the standard route under the car and duplicated the exhaust end angle.  The difference is I used larger tubing and mufflers to match the 4 bolt manifolds.  When the car is running it sounds much different inside and outside from the normal offering Chrysler offered back in the day.  Also IMO the performance is better based on other 300Bs I've had the opportunity to drive.

John Lazenby 






On Saturday, August 27, 2022 at 09:54:22 AM PDT, rdr_inc <rdr_inc@xxxxxxxxxx> wrote: 





That's been in print many times over the years, and never challenged or refuted.

The 340 hp (std) 300B was 9.0 : 1 cr, but the factory apparently built the 355 hp option with 10.0 : 1 cr, and larger diameter exhaust pipes.

Rick Haynes Dutkiewicz 



Sent from my Galaxy


-------- Original message --------
From: Charles Schoendorf <cschoend@xxxxxxxxxxxxx> 
Date: 2022-08-27 12:34 p.m. (GMT-05:00) 
To: Larry Wood <larryjw7@xxxxxxxxx> 
Cc: John Lazenby <french_fryguy@xxxxxxxxx>, chrysler 300 club <chrysler-300-club-international@xxxxxxxxxxxxxxxx> 
Subject: Re: {Chrysler 300} 56 300B 

I believe I read somewhere along the way that quoting 355HP from 354 cubes qualified this ‘option’  to be the first Detroit production engine to make over 1 HP per inch. May have been a marketing tactic. Who knows.

Chuck
C-300

> On Aug 27, 2022, at 11:53 AM, Larry Wood <larryjw7@xxxxxxxxx> wrote:
> 
> Thanks for the info. 
> 
> On Sat, Aug 27, 2022, 11:07 AM John Lazenby <french_fryguy@xxxxxxxxx> wrote:
>> For years I've had calls with owners of 300Bs stating their car is a 355HP example.  I always come back with the same comments.  "How do you know this and can you provide documentation?"  At that time the discussion always goes "soft" as no one has ever been able to provide such.
>> 
>> Recently in my files I located a factory confidential bulletin regarding this HP upgrade.  This document is dated mid June, 1956 which  pretty much is after production of the 1956 Letter Cars had completed.  Just yesterday I had a long phone conversation with Mark Obermann who maintains the club's micro film and he has never been able to find anything on this option.  So my question is why did the bulletin appear after the fact?  One can speculate on this but until hard documentation appears it is all "myth" as far as I'm concerned.
>> 
>> Years ago in numerous conversations with the late Gil Cunningham we discussed this topic in great depth.  Gil was of the same opinion as me that these changes more than likely went to owners with "race" examples and probably not the general public.
>> 
>> Everyone wants their 300B to be a "special" one but as far as I'm concerned all 300Bs are "special".
>> 
>> John Lazenby
>> MYC 1955 C300 - 1956 300B
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>> On Saturday, August 27, 2022 at 06:08:44 AM PDT, Larry Wood <larryjw7@xxxxxxxxx> wrote: 
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>> Does anyone know how to tell if the Engine is a 340 Horse Power.or a 355             Horsepower?
>> 
>> 
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