Re: IML: 1959-1966 vs 1967-78 Power Goodies

["RODGER D. REDDISH" <FltSgt@xxxxxxx>]

Hola Chris & Joslin

 

At the bumper end, ask for the "MoPar Hook".  It started in 1956 and from the side view has an lazy ? shape.

 

If you go smaller than your exhaust manifold diam you will loose some 40 to 80 MPH performance with gas miliage figures.  If you believe the inside diam of 2 1/2 inch is the way to go, then you will loose the idle to free way cruise power.

 

You are correct in saying that shops what to sell you the shortest muffler on the shelf.  They do make an 2 1/4 inch in and an 2 1/4 inch out muffler.  They also make an dual 2 1/4" in with an single three inch out muffler.

 

Some years back I purchased four "in the box" GTX mufflers in Denver.  I made duals on the 63 Gla Blue Le Baron.  It sounded to much as an GTX so the 2 1/4" resonators spec'd for an 1970 C-300 hushed it up.

 

Uncle Rodger

----- Original Message -----

From: Frederick Joslin

To: mailing-list@xxxxxxxxxxxxxxxx

Sent: Tuesday, March 20, 2007 10:59 AM

Subject: Re: IML: 1959-1966 vs 1967-78 Power Goodies

Hi Chris:

I put a dual exhaust system on my 69 two years ago. It is either 2 1/4" or 2 1/2", I am not sure. It is louder than I really like so be careful if you want the car to be Imperial quite. The louder mufflers are typically cheaper and most muffler shops are geared towards the muscle "car as aloud as possible" option. I did ask for the quiet end of the range. Look to honking big SUV mufflers if you really want quite. I am thinking of adding a couple of "turbo mufflers" or something similar as resonators near the rear. I had the shop install a crossover tube which is supposed to reduce back pressure more and make the car a little quieter. It also has the effect of really holding the systen tight. I had the shop try to set up the exit pipes as if they were "factory" so they come straight out just short of the bumper on either side of the fuel tank and are curved down cut off at about 45 degrees towards the back of the car. I have just the steel exit pipes, not anything chrome or SS.

I know that the 69s did not come with dual exhaust, but I needed an entire new system anyway and this is what I wanted and it looks pretty good. It does not jump out at you that the car has dual exhausts.      

I also have a round chrome air cleaner. Be careful with clearance to the hood. I believe that I have the 3" filter element and it sits right against the hood. Again in a 69.

----- Original Message -----
From: "Chris Strohmeyer"
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML: 1959-1966 vs 1967-78 Power Goodies
Date: Mon, 19 Mar 2007 21:01:51 -0700

I'm up for dual exhaust with quiet turbo mufflers.  Then I'll install a circular air cleaner.  Would the same diameter pipes for the dual exhaust be ok or should I go smaller? This is for my 67 Imperial 440.

Thx,

Chris Strohmeyer

----- Original Message -----

From: RODGER D. REDDISH

To: Imperial-msg

Sent: Monday, March 19, 2007 4:55 PM

Subject: IML: 1959-1966 vs 1967-78 Power Goodies

Hola Class

 

The first series wedge V8 ( aka 1959 413 ) to the first series 440 ( aka 1966 ) use an center dump only manifold on the driver's side.  You may buy all the C-Body HP manifolds that epay has to offer for the next six years and you will never find one that fits.  The only way to gain exhaust manifold bolt on OEM performance is to get the 1972- 1978 Dodge Truck B/RB center dump manifolds.  An yes they are of the HP Design.

 

If you have an 1967 - 1978 Imperial with-out the HP option ( single snorkel air cleaner and factory single exhaust muffler is an give away ), then look for the C-Body Exhaust manifolds of that era.  The un-knowing purchase the B-Body driver's exhaust manifold and cuss or whatever when they will not fit.

 

If you have either of the above cars and want the factory look with bolt on power, the above is the answer.  There is no bending, cutting or what ever.

 

The best diam for the exhaust system is to keep the inside diam of the factory exhaust manifolds to the rear ( dual exhaust ).  If you think an larger diam is better, then do it.  Just do not complain mently at an later time that your car has no bottom end power.

 

The "Hugger" tube headers sold by some are an tube copy of what MoPar started back with the V8's ( 1951 ).  They are good from mid-range to redline due to their diam.  If that is how you plan on driving to the "Salt Flat's", then get them.

 

Due to the weight of our cars ( MoPar Perfornace sez ) the MoPar cam assembly number P4286675 is the best if you have an 413 or an 440.

 

And the carb that came on the car or the cross-over Carter AVS ( or the like size "Eddy" ) is the best size.

 

The last bang for the buck item is the factory dual snorkel air cleaner.  They made a dual snorkel verson of your single snorkel in every year they were making snorkeled air cleaners.

 

There is more, but it is supper time ...

 

Uncle Rodger & Aunt Gabby

COS

 

ps

The 1966 or older Imperial is an "D-Body", not an "Y".  The last series starter motor is at NAPA too ( No hard to find mistery number to seek ).

Fred Joslin