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headers or duals? just the facts, please
https://www.slantsix.org/forum/viewtopic.php?t=22908		 Page 3 of 4
Author:  Ron Parker [ Mon Apr 30, 2007 6:28 pm ]
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In my experance over say 30 years that headers on a daily driver not a cruse in car that headers are a pain in the butt If you run them all the way back to the rear end or over the rear axle. The ehaust system will flex more and headers have to give some where and most of the time that is at the exaust port. They do have better exhust gaskets for Mopar V8s but not for the Slant. Cox Bros Gasket I have run the same gasket for 3 years and a head gasket change. Good Stuff :D Thanks Ron Parker






Bagel Doint Know The Differance Between A Yankee And A Redneck
Author:  slantzilla [ Mon Apr 30, 2007 8:49 pm ]
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I can gaurantee that headers will not add more heat under the hood than 2 20 pound pieces of cast iron with 2 exhaust pipes.

Naw, ya cain't, because they will.
Yeah Dan, that's the first thing that I noticed on my red car is how cool the manifolds and pipes are. :roll: :roll:
Author:  sick6 [ Tue May 01, 2007 5:02 am ]
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..........then use an exhaust hanger ron. They are quite useful.
Author:  SlantSixDan [ Tue May 01, 2007 7:52 am ]
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I live in minnesota, and when we used to have winters, we had -40 wind chills
I never had any problems with cold starting, ever.
Headers wouldn't tend to cause problems with cold starting. The absence of manifold heat would affect driveability with a cold engine and cold ambient temperature. The driveability issues can be masked by adding more fuel via carburetor tuning, but then you're looking at an MPG drop.
Author:  sick6 [ Tue May 01, 2007 8:28 am ]
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the car got 25 MPG consistantly.....I think thats pretty good.
Author:  slantzilla [ Tue May 01, 2007 11:22 am ]
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the car got 25 MPG consistantly.....I think thats pretty good.
It couldn't have. Dan said so. :roll: :roll:
Author:  sick6 [ Tue May 01, 2007 12:08 pm ]
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:D



well, I wasn't trying to flame dan, its just I haven't had any of the problems I keep hearing about......

the best mileage it ever got was 30, on a long distance trip. If I remember right it was about a 3+ hour drive one way......going on a family vacation.

3-speed manual by the way.
Author:  SlantSixDan [ Tue May 01, 2007 12:11 pm ]
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the car got 25 MPG consistantly.....I think thats pretty good.
It couldn't have. Dan said so. :roll: :roll:
1) I never mentioned specific mileage figures. 25 is good. 26 or 27 would be better, and 23 or 24 would be not as good.

2) If you dislike my posts (as seems to be the case today), keep in mind nobody forces you to keep reading them.
Author:  SlantSixDan [ Tue May 01, 2007 12:17 pm ]
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Yeah Dan, that's the first thing that I noticed on my red car is how cool the manifolds and pipes are. :roll: :roll:
Maybe you're interested in the temperature of the manifolds and pipes themselves, but the conversation you're participating in is more concerned with the temperature of the engine bay in general. The two are related, of course, but they're not the same phenomenon.
Author:  Aggressive Ted [ Tue May 01, 2007 12:30 pm ]
Post subject:  25 mpg
Slantzilla,

I drive 120 miles a day and am running a near stock rebuild. I am having a hard time breaking over 20 mpg. I do run the car pretty hard through the foothills of the Cascade Mountains, up and down hills, twisty roads passing allot of folks and some freeway driving. It is a toss up as to what jet to use in the Holley 1920. A #58 does the same as a #60. The #60 keeps me out of the power valve a little more, but nets the same average mileage.

I would love to do an upgrade but am not sure what combination would help net more power and better mileage. Most folks seem to think going to the Super Six setup is best, but instead of buying everything and experimenting.....,

Could you share what headers you are using?
brand name, long or short, single or dual exhaust, diameter of exhaust?

and what intake manifold and carb your running?

25 miles per gallon would be fine with me!
Infact, anything over 20 mpg would make me happy at the price gas is going for lately, (3.18 per gallon).
Author:  slantzilla [ Tue May 01, 2007 4:50 pm ]
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Since I have an early A body I have been stuck with a Clifford header. While it is a vast improvement over a stock exhaust manifold, I feel the Clifford does leave a lot to be desired since it is mainly designed for fit and not function.

I have a set of Spitfire step headers on the way and hopefully will be able to provide some dyno numbers on them vs. the Cliffords.

On the later A bodies my favorite pipe was the Mopar Performance/J&R header, but it too is a crapshoot as to whether it will fit your car or not. They still turn up for sale now and then.

A Super 6 is a good upgrade IF you get a good carb. Problem is that most of the BBD's still in existence have the throttle shafts worn out and leak vacuum like a sieve causing all sorts of issues.

My personal favorite is still an Offy intake and a 390 vacuum secondary Holley, but that's just me.

Have you done anything with your distributor? A stock distributor has so much mechanical advance it is almost impossible to get enough initial timing into them without pinging under load. Welding in the advance slots about half way and putting in lots more lead may help. :shock:
Author:  Aggressive Ted [ Tue May 01, 2007 6:10 pm ]
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Yes, I run 18 degrees initial and have a 11R vacuum advance (22 degrees) backed off about 2.5 turns so it doesn't kick in at a 750 rpm idle, (600 rpm in gear) and a 10R govenor (another 20). So that puts me at 60 degrees total timing and I still can't get it to ping on Cenex regular! Cenex is farm gas out here.

I have also done the Slant Six Dan upgrades, NGK UR4GP plugs at .040, Echlin MO-3000 rotor and Bluestreak cap, 8mm wires and MSD Blaster 2 coil.

My motor starts up cold with a bang! only one pump of the 1920 Holley with a #58 jet. That is at 4:30 in the morning and starts well after hot (running about 2 hours to work) if I barely crack the throttle plates then hit the starter. I must say Dan's mods really make starting a snap!

I cruise between 50 mph (2000 rpm) on the back roads to 60 mph (2500 rpm) on the freeway. I am looking to fine tune the motor for that rpm band. My stock 1.5" exhaust system is just about done and I need to replace it. That is why I was looking for advice on header length or manifolds types and exhaust systems, single or dual, and what diameters. I would like to enhance the torque in that range to turn the tall (2.76) gearing.

Any suggestions to improve that rpm band would be appreciated!
Author:  sick6 [ Wed May 02, 2007 4:56 am ]
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I have a set of Spitfire step headers on the way....
Still?

what is the latest on this situation?
Author:  slantzilla [ Wed May 02, 2007 5:06 am ]
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Quote:
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I have a set of Spitfire step headers on the way....
Still?

what is the latest on this situation?
Harold has an update posted on the board. They are suppose to be going together and I will have a set for testing shortly.
Author:  Mister Twister [ Wed May 02, 2007 8:44 am ]
Post subject:  Header/Headers
I love testing!!!
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