RE: {Chrysler 300} RE: Exhaust Pipe Size

John,

I am not sure I understand your last note. I am talking about the four bolts that pass through the holes in the manifold and such the header pipe up to it. The manifold does not have any studs, just bolts and nuts.

I do know that one does not want the bolts to “thread” into the cast iron hole if that is what you mean. That is why I asked if the bolts are 3/8 inch or 7/16 inch.

Since the shop will be doing the work, I want to give them the nuts and bolts and put a lot of high heat anti-seize compound on them as they probably would not.

I am spending the money to have them use those special clamps that allow for the easy removal of the pipes. These use collars that weld to each end of the pipe and use a big clamp that pulls the two sides together. They just cost about $60 each!

Since I know I must pull the trans in the next six months and I will probably pull and clean the gas tank, the ability to get the pipes out of the way is a good idea.

James

From: John Grady <jkg@xxxxxxxxxxxxxxxxx>
Sent: Tuesday, March 28, 2023 07:06
To: James Douglas <jdd@xxxxxxxxxx>
Cc: GREGORY PICHE <picgrego@xxxxxxx>; Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} RE: Exhaust Pipe Size

james ,

use smaller stainless bolts with nuts and washers , avoid threading into manifold at all . They are plenty strong , even as small as 1/4 is over 1000 lbs . but don’t go that small

unless necessary. use split washer lock washers too as it changes size with temp .

SS can “ gall” in iron threads you will break manifold ear off one day down the road Threads into exhaust manifold are always a bad idea . With nut you can always just cut it off .
John

Sent from my iPhone

On Mar 28, 2023, at 9:51 AM, 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Gregory,

Do you happen to know the length of the exhaust manifold to pipe bolts? I think they are 7/16 inch as the head takes a 5/8 wrench. That is unless the bolts are “heavy head” and they are 3/8.

The car is going into the shop on Thursday for a completely new exhaust. I want to get four stainless steel bolts for the exhaust manifold flanges.

James

From: 'GREGORY PICHE' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Tuesday, March 28, 2023 03:44
To: James Douglas <jdd@xxxxxxxxxx>
Cc: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} RE: Exhaust Pipe Size

Single 4 bbl 413 2 1/4” - 2”. Cross ram 413 2 1/2” - 2 1/4”.

Sent from my iPhone

On Mar 27, 2023, at 12:59 PM, 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Ok, I found the webpage on the club site….James

From: 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Monday, March 27, 2023 09:45
To: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} Exhaust Pipe Size

I have found a shop that looks like they can do what I want on the 300K this week.

What I need to know is what is the header down pipe size from the factory and what is the tailpipe size.

I could not find an AMA sheet on the internet, and I got no response to my inquiry here on that.

The 1962 AMA which is online shows the header pipe at 2.25 inch and the tail pipe at 2.0 inch.

The only non-stock routing we will do is add a cross over pipe for better low-end torque as I may or may not change the rear end to a numerically lower ratio and that would help.

If anyone has the information on pipe sizes for 1964 please let me know.

James

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