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Re: Headers for a 5th Ave? 360 2bbl or 4bbl for 318
[Re: fullmetaljacket]
#1317061
10/10/12 02:39 PM
10/10/12 02:39 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
What do you guys think of using HP 340 exhaust manifolds with a 2-1/4 dual exhaust all the way to the back would do on bone stock 318 or 360?
http://www.moparmusclemagazine.com/techa...st/headers.html
the HP340 manifolds will do nearly squat....5th ave's have 360 sized exhaust manifolds, so in this article, ~1hp and 2 lb-ft on a mild 360...
and I am not sure if the HP340 manifolds will clear the huge brake booster on these cars.
magnum manifolds, you'd probably see the same miniscule power improvement, and when I was eyeballing the magnum manifolds on my '96 ram and the engine compartment on my 5th ave, I'm 99% sure they'd either hit the firewall, or potentially interfere with the shift linkage of the column shifter.
notel, the long tube headers only gained 16hp over 318 manifolds, and 5hp over 360 manifolds, but the torque gains were 20 and 16 lb ft. respectively
the duals replacing the stock 1 7/8" single will do more to add power and efficiency than the manifolds or headers
Last edited by patrick; 10/10/12 02:47 PM.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Headers for a 5th Ave? 360 2bbl or 4bbl for 318
[Re: patrick]
#1317062
10/10/12 10:03 PM
10/10/12 10:03 PM
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Joined: Jan 2003
Posts: 3,472
Lubbock, TX
Erics5th
UsedtobeSatellite6
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UsedtobeSatellite6
Joined: Jan 2003
Posts: 3,472
Lubbock, TX
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I don't run headers, but I (actually the PO) did install a Y pipe from an Aspen R/T to a 2.5" pipe, Flowmaster (I know, I know) 44 muffler and 2.5" tail pipe.
Eric
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Re: Headers for a 5th Ave? 360 2bbl or 4bbl for 318
[Re: patrick]
#1317065
10/10/12 11:50 PM
10/10/12 11:50 PM
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Joined: Mar 2012
Posts: 168
Washington State, USA
Winchester 73
member
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member
Joined: Mar 2012
Posts: 168
Washington State, USA
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Quote:
Quote:
What do you guys think of using HP 340 exhaust manifolds with a 2-1/4 dual exhaust all the way to the back would do on bone stock 318 or 360?
http://www.moparmusclemagazine.com/techa...st/headers.html
the HP340 manifolds will do nearly squat....5th ave's have 360 sized exhaust manifolds, so in this article, ~1hp and 2 lb-ft on a mild 360...
and I am not sure if the HP340 manifolds will clear the huge brake booster on these cars.
magnum manifolds, you'd probably see the same miniscule power improvement, and when I was eyeballing the magnum manifolds on my '96 ram and the engine compartment on my 5th ave, I'm 99% sure they'd either hit the firewall, or potentially interfere with the shift linkage of the column shifter.
notel, the long tube headers only gained 16hp over 318 manifolds, and 5hp over 360 manifolds, but the torque gains were 20 and 16 lb ft. respectively
the duals replacing the stock 1 7/8" single will do more to add power and efficiency than the manifolds or headers
i can say ive seen magnum manifolds on an e body but i think headers wouldent hurt mileage and would add fun factor to a commuter.
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Re: Headers for a 5th Ave? 360 2bbl or 4bbl for 318
[Re: Winchester 73]
#1317066
10/11/12 12:25 AM
10/11/12 12:25 AM
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Joined: Jan 2005
Posts: 4,463
Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,463
Michigan
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In all honesty, I would get another car. My F150 posted better mixed numbers than these things put out. Don't get me wrong, I love mine, but they're just not mileage makers.
1987 Fifth Avenue - 512/518/D60
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Re: Headers for a 5th Ave? 360 2bbl or 4bbl for 318
[Re: Winchester 73]
#1317070
10/11/12 08:25 AM
10/11/12 08:25 AM
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Joined: Feb 2003
Posts: 6,849
fullmetaljacket
master
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master
Joined: Feb 2003
Posts: 6,849
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Re: Headers for a 5th Ave? 360 2bbl or 4bbl for 318
[Re: MarkZ]
#1317072
10/11/12 02:18 PM
10/11/12 02:18 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
In all honesty, I would get another car. My F150 posted better mixed numbers than these things put out. Don't get me wrong, I love mine, but they're just not mileage makers.
they're OK if they're biased towards highway. getting 2 tons moving with a 2.24 rear sucks the gas in stop and go. mine, in-town mileage was as good or better after all the mods that more than doubled HP with the 3.55's/A500. the 3 speed tranny is a big limitation. personally I think an A833OD (with it's 3.09 first, .73 OD) and 2.94-3.23 rear gears would drastically improve mileage in these beasts.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Headers for a 5th Ave? 360 2bbl or 4bbl for 318
[Re: 76dodgeboy]
#1317073
10/11/12 02:37 PM
10/11/12 02:37 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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Quote:
Quote:
In all honesty, I would get another car. My F150 posted better mixed numbers than these things put out. Don't get me wrong, I love mine, but they're just not mileage makers.
If your going to buy me another car that's better on gas and won't crumpled like a pop can in a collision Id like a Magnum wagon or a New Durango.
18-24mpg is perfectly fine with me. My 84 Toyota pickup with a 22r and 5spd gets around 20mpg. I got the car cause Im not putting a baby in the Toyota. 5th aves and dippys do Extremely well in demos.
Don't compare demo derby durability with real-life car accidents, the dynamics of both the crash and the cars is drastically altered. If your babyseat is in teh center of the backseat almost any car above compact-size should be OK. The momentum of the vehicle hitting you is the biggest consideration, and a newer car will crush more at the edges and absorb that energy better than an older car. **My point - a 300M or mid-90s Buick Century/Regal, etc will give much better MPG and probably be safer.
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Re: Headers for a 5th Ave? 360 2bbl or 4bbl for 318
[Re: Winchester 73]
#1317074
10/11/12 03:39 PM
10/11/12 03:39 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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Quote:
remember gas miles is something not to thaught as 1 or two miles per gallon but a tenth or twentieth of a mile per gallon compuonded over a year of driving!
 I'll come back to this.
Modifying an old car as an MPG project, for the purpose of saving $$, requires some well-planned assumptions and then some calculations.
I have an AHB Dippy that gets around 15-16 mpg mixed driving. I looked at putting in an A500 and assumed it would take me from 15.5 to 18.6 (a 20% increase) and cost $500 (a conservative amount, even if DIY). At 3.85/gal, it would take 12,077 miles to pay itself off. Not bad.
But...
Be aware that the higher your starting MPG, the longer the same mpg increase takes to pay off. Let's take the same $500 and $3.85, going from 15 to 20 mpg has a 7800 mi payoff. That's low-hanging fruit, and would be worthwile. To take the same 5mpg increase, but from 20 to 25, has a 13,000 mile payoff. To get the same 7800-mile payoff requires going from 20mpg to 30!!!
And the higher your base mpg, the more expensive/less return for your modifications.
To be realistic, let's say we can find 3 more MPG (I think planning/expecting to get more than 23 mpg mixed from a boxy M is unrealistic). Going from 20-23 (a more difficult phase of the project) at the same cost/gas price has a 19,900 mile payoff. (and after the OD, I don't think there's another 3 mpg to be had for only $500, so that 19,900 is suspect).
Oh, and going from 15 to 15.1, if you did that for just $50, it would take 29,400 miles for payoff. From 20 to 20.1 takes 52,200 miles.
All food for thought. 
Parts I seek:
driver doorpanel, 65 Sport Fury, prefer black, needs to be 7-8 on 10 scale, might buy set
16" x 6" Dodge truck wheel(s), from early 70s?, takes 9" dogdish - need for a research job so cheaper is better.
69-73 C-body caliper brackets and/or splashields
Send a PM.
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with will be in the plans now. Wheres a good place to get the pullies at a reasonable price? I don't know that I want manual steering on it but will give it some thought..
