Re: MPG 318 VS 360
[Re: The Sphinx]
#837387
10/24/10 11:05 AM
10/24/10 11:05 AM
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Joined: Jan 2003
Posts: 28,078
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,078
Irving, TX
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At the low rpm you're going to be holding, I'd stuff the 318 in there.
For some reason the 360 has never returned the mileage of the 318.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: MPG 318 VS 360
[Re: The Sphinx]
#837388
10/24/10 01:07 PM
10/24/10 01:07 PM
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Joined: Jan 2006
Posts: 8,162
USA
360view
Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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I can't say for 1972 specs, but in Jan of 1997 Popular Mechanics magazine had reader's surveys .. first one on Dodge Rams ... then a few years later on Durangos In the Ram survey, owners reported the 1.8 MPG on the highway better on the 5.2 versus the 5.9 V8s. http://web.archive.org/web/2005103120593...?page=3&c=yI don't have the Durango one bookmarked, but i think the MPG difference was smaller, maybe 0.75
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Re: MPG 318 VS 360
[Re: 360view]
#837389
10/24/10 02:51 PM
10/24/10 02:51 PM
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Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
HotRodDave
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I Live Here
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Posts: 12,424
Kalispell Mt.
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The 360 has lower compression, bigger cam, bigger ports(slower ports) so the gas miledge will be even a bigger differance than the magnum motors that share the same heads with just slightly different cams and compression.
If you built them to similar specs then the differance would be smaller but the 318 would still get better mpg.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: MPG 318 VS 360
[Re: The Sphinx]
#837391
10/25/10 09:28 AM
10/25/10 09:28 AM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
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I Live Here
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Florida
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360 is bigger bore and longer stroke which suxs more gas  its a no brainer for MPGS  thats another reason the 318 is called whimpy,smaller bore and shorter stroke is less torque  little hoter cam,small 4-v,headers does a 318 good and still gets better mpgs over a 360 stock or built A q-jet works very good on a 318 for MPGS also 
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Re: MPG 318 VS 360
[Re: The Sphinx]
#837392
10/25/10 09:29 AM
10/25/10 09:29 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
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I Live Here
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Grand Haven, MI
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why build to factory specs? I'd copy hotroddave's super duper MPG 318 build, or if you want a hydraulic cam, I'd start with a magnum 318, use KB167's at 0 deck, and run a reground cam with bullet cam's HR259/316 lobe on both the intake and exhaust. http://www.bulletcams.com/Masters/HRlobes.htm
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: MPG 318 VS 360
[Re: scratchnfotraction]
#837393
10/25/10 02:12 PM
10/25/10 02:12 PM
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Joined: Jun 2010
Posts: 591
Champion City
The Sphinx
OP
mopar
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OP
mopar
Joined: Jun 2010
Posts: 591
Champion City
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Quote:
360 is bigger bore and longer stroke which suxs more gas
its a no brainer for MPGS
That is why the question asked is what would be the difference, implying that there would be a known difference
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Re: MPG 318 VS 360
[Re: patrick]
#837394
10/25/10 02:13 PM
10/25/10 02:13 PM
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Joined: Jun 2010
Posts: 591
Champion City
The Sphinx
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mopar
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OP
mopar
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Champion City
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Quote:
why build to factory specs?
I'd copy hotroddave's super duper MPG 318 build, or if you want a hydraulic cam, I'd start with a magnum 318, use KB167's at 0 deck, and run a reground cam with bullet cam's
HR259/316 lobe on both the intake and exhaust.
http://www.bulletcams.com/Masters/HRlobes.htm
Because the 318 in question is already built.
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Re: MPG 318 VS 360
[Re: The Sphinx]
#837396
10/25/10 03:19 PM
10/25/10 03:19 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
why build to factory specs?
I'd copy hotroddave's super duper MPG 318 build, or if you want a hydraulic cam, I'd start with a magnum 318, use KB167's at 0 deck, and run a reground cam with bullet cam's
HR259/316 lobe on both the intake and exhaust.
http://www.bulletcams.com/Masters/HRlobes.htm
Because the 318 in question is already built.
I'd at least swap the cam to a lunati voodoo 60400, and the carb to a 4bbl w/a 600 eddie or a small q-jet/tquad...
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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