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Let's Talk Headers and Exhaust
#2488594
04/27/18 09:30 AM
04/27/18 09:30 AM
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Joined: Mar 2017
Posts: 195 Coastal Maine
Mr onetwo
OP
member
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OP
member
Joined: Mar 2017
Posts: 195
Coastal Maine
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Good day to all, I am planning the exhaust system for my '78 440 RC and need some opinions.I have purchased a really nice set of Doug Thorley Tri-Y headers for starters.I don't want to deal with header gasket leaks and don't mind spending the extra for Remflex graphite or Percy's Seal-4-Good aluminum ones.Which would you guys use on a normal street truck up to around 400 HP? Reliability is the top priority.Also..bolts or studs? I want this system to go into a single 3" after the transfer case.I think there is room for a Y pipe , H pipe to dual inlet muffler or an X-pipe type deal.I will be doing a fuel/air guage for tuning purposes so the h or x is better in my mind for O2 sensor location....thoughts on this? I also need advice on mufflers.I want a nice deep tone with no droning...maybe Flowmaster 50's...I don't know? ??? Finally, I think the Walker 45105 tailpipe from a 92-93 Cummins truck would be a cheap solution to work with the stock exhaust location...thoughts?This 440 will always be mild and I want nice street manners for it.I do want to put EFI on it eventually but will stick to the existing Holley 4175 that's on it for now.I have attached a photo of a good design I think.Thanks to all!
Last edited by Mr onetwo; 04/27/18 09:50 AM.
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Re: Let's Talk Headers and Exhaust
[Re: Mr onetwo]
#2488727
04/27/18 05:21 PM
04/27/18 05:21 PM
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Joined: Feb 2003
Posts: 10,209 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,209
Someplace you aren't
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Can you get those headers for 2wd? I was looking recently for 77 d150 with 440 and didn’t see an offering from doug.
I want my fair share
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Re: Let's Talk Headers and Exhaust
[Re: SomeCarGuy]
#2488771
04/27/18 07:08 PM
04/27/18 07:08 PM
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Joined: Mar 2017
Posts: 195 Coastal Maine
Mr onetwo
OP
member
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OP
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Joined: Mar 2017
Posts: 195
Coastal Maine
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Can you get those headers for 2wd? I was looking recently for 77 d150 with 440 and didn’t see an offering from doug. They were used, but in perfect shape...ceramic coated.Unfortunately, you can't get them any more.I was very lucky to find them!
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Re: Let's Talk Headers and Exhaust
[Re: scratchnfotraction]
#2488772
04/27/18 07:09 PM
04/27/18 07:09 PM
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Joined: Mar 2017
Posts: 195 Coastal Maine
Mr onetwo
OP
member
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OP
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Joined: Mar 2017
Posts: 195
Coastal Maine
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oh I always add o2 in the header collector right next to the evac valve so it stays pluged in unless header is R&R
convenient would come to mind on this location me thinks wouldn't be more accurate (both banks mixed)to have it in the X-pipe?
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Re: Let's Talk Headers and Exhaust
[Re: Mr onetwo]
#2488901
04/28/18 12:29 AM
04/28/18 12:29 AM
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Joined: Jan 2011
Posts: 15,871 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,871
Central Florida
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Curious, gas tank in way the reason you're not going with dual exhaust?
I'm looking to do my exhaust too '79 Power Wagon
Facts are stubborn things.
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Re: Let's Talk Headers and Exhaust
[Re: Mr onetwo]
#2488902
04/28/18 12:30 AM
04/28/18 12:30 AM
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Joined: Feb 2003
Posts: 10,209 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,209
Someplace you aren't
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On the Muffler’s, I had a long thread going in the main tech section. Some good info there. Too bad the setbacks I’ve had have shelved the exhaust project.
I want my fair share
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Re: Let's Talk Headers and Exhaust
[Re: larrymopar360]
#2488903
04/28/18 12:31 AM
04/28/18 12:31 AM
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Joined: Mar 2017
Posts: 195 Coastal Maine
Mr onetwo
OP
member
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OP
member
Joined: Mar 2017
Posts: 195
Coastal Maine
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Curious, gas tank in way the reason you're not going with dual exhaust?
I'm looking to do my exhaust too '79 Power Wagon Yes, there isn't much room on the driver side
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Re: Let's Talk Headers and Exhaust
[Re: Mr onetwo]
#2488916
04/28/18 01:05 AM
04/28/18 01:05 AM
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Joined: Jan 2011
Posts: 15,871 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,871
Central Florida
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Curious, gas tank in way the reason you're not going with dual exhaust?
I'm looking to do my exhaust too '79 Power Wagon Yes, there isn't much room on the driver side Same here. I have dual tanks. Going to remove under bed tank I think, and just go with in cab tank. I really want dual exhausts.
Facts are stubborn things.
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Re: Let's Talk Headers and Exhaust
[Re: Mr onetwo]
#2488925
04/28/18 01:24 AM
04/28/18 01:24 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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oh I always add o2 in the header collector right next to the evac valve so it stays pluged in unless header is R&R
convenient would come to mind on this location me thinks wouldn't be more accurate (both banks mixed)to have it in the X-pipe? if running a single 02 yes.
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Re: Let's Talk Headers and Exhaust
[Re: Mr onetwo]
#2488937
04/28/18 02:11 AM
04/28/18 02:11 AM
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Joined: Feb 2003
Posts: 10,209 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,209
Someplace you aren't
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On the topic, what’s the deal with all the 200 dollar SS headers on eBay for these trucks? Chinese knock offs of headman or hooker?
I want my fair share
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