Re: Old 318 with new magnum heads...yay or nay?
[Re: BulletBob]
#1180324
02/18/12 02:20 PM
02/18/12 02:20 PM
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Joined: Jan 2003
Posts: 4,323 NY NY
340duster340
master
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master
Joined: Jan 2003
Posts: 4,323
NY NY
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why not just get a mag318 core and use that
1966 Dart GT
...down to only 1 mopar for the first time in 15 years!
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Re: Old 318 with new magnum heads...yay or nay?
[Re: 340duster340]
#1180326
02/18/12 05:23 PM
02/18/12 05:23 PM
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Joined: Dec 2005
Posts: 9,719 Home
SRT6776
I hate internal combustion engines!
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I hate internal combustion engines!
Joined: Dec 2005
Posts: 9,719
Home
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Quote:
why not just get a mag318 core and use that
X2 may as well just change motors. They gotta be giving away 5.2 and even 5.9 Magnums by now. I'd even look into early 03-08 non VCT 5.7L Hemi's, even if just for reference sake.
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Re: Old 318 with new magnum heads...yay or nay?
[Re: 3hundred]
#1180328
02/19/12 12:33 AM
02/19/12 12:33 AM
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Joined: Mar 2005
Posts: 1,630 North Central Florida
eightlitermopar
OP
top fuel
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OP
top fuel
Joined: Mar 2005
Posts: 1,630
North Central Florida
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Quote:
Quote:
why not just get a mag318 core and use that
I agree, the 318 mag is a sweet little package that blows the doors off the older ones. Mileage is good as well, wife's 318 magnum Ramcharger knocks down 20 MPG on the road.
318 mag is a virtual bolt in, very easy swap, old engine mounts are there, transmission pattern is the same, sealing is greatly improved over the old engine.
Robert
So the 904 would bolt right up?
I know the 518 would be sweet, but you can see where this is going. A simple regasket turns into...."well, while I am here, I might as well..."
I get carried away pretty quickly.
eightlitermopar
Mopar or no car
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Re: Old 318 with new magnum heads...yay or nay?
[Re: eightlitermopar]
#1180329
02/19/12 12:58 AM
02/19/12 12:58 AM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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904 will bolt up to a 5.2 Mag just fine (if you are converting the Mag to carb'd instead of OE injection). If you want to keep the Mag injected, You'll need to notch the 904 bell housing to allow fitment (of a crank position sensor???).
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: Old 318 with new magnum heads...yay or nay?
[Re: BulletBob]
#1180333
02/19/12 10:33 PM
02/19/12 10:33 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
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Posts: 6,167
Maryland
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Intake ports are about the same between LA and Magnum. Maybe you are thinking about the exhaust ports? There is a difference between LA and Magnum exhaust ports... bolt pattern is the same, but the floor of the Magnum port is raised for better flow. If trying to mate LA exhaust manifolds or headers to Magnum heads, I'd suggest using "Remflex" gaskets to make sure they seal at the bottom of the port.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: Old 318 with new magnum heads...yay or nay?
[Re: BulletBob]
#1180335
02/20/12 08:03 AM
02/20/12 08:03 AM
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Joined: Mar 2005
Posts: 1,630 North Central Florida
eightlitermopar
OP
top fuel
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OP
top fuel
Joined: Mar 2005
Posts: 1,630
North Central Florida
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So what about the cast iron heads? Did they have problems with castings for a while? It seems good, but I have to remember that a lot of these big full size vans or trucks with the magnum motor are in the junkyard for a reason. If so, what to look for, avoid, etc. eightlitermopar
Mopar or no car
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Re: Old 318 with new magnum heads...yay or nay?
[Re: eightlitermopar]
#1180336
02/20/12 09:22 AM
02/20/12 09:22 AM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
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Quote:
So what about the cast iron heads? Did they have problems with castings for a while? It seems good, but I have to remember that a lot of these big full size vans or trucks with the magnum motor are in the junkyard for a reason.
If so, what to look for, avoid, etc.
eightlitermopar
I've heard rumors they're all cracked, just not in a critical place. My wife's truck is about to turn over 298,000 miles with no engine trouble. I pulled the 360 out of the other truck with 168,000 miles for the hemi swap, not because it was having any troubles.
Robert
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Old 318 with new magnum heads...yay or nay?
[Re: CrAlt]
#1180338
02/26/12 03:06 PM
02/26/12 03:06 PM
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Joined: Apr 2004
Posts: 538 Marilla, New York
RalleyA12
mopar
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mopar
Joined: Apr 2004
Posts: 538
Marilla, New York
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Quote:
Why not just keep it simple and swap on some '302 swirl port heads?
Everything you have now will bolt up. No fancy intake or manifolds needed. They are already set up for unleaded gas. And they flow better then the old 318 heads.
Magnum heads are better but if you are keeping the motor stockish i dont think they are worth all the extra crap you have to do to make them fit.
You must keep things in perspective, you're only feeding 318 cubic inches, you don't need a real high CFM head, leave those for the 408 stroker crowd. Pocket ported 302's with a 1.88 intake would be the way I'd go.
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Re: Old 318 with new magnum heads...yay or nay?
[Re: RalleyA12]
#1180340
02/26/12 07:43 PM
02/26/12 07:43 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
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Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
Why not just keep it simple and swap on some '302 swirl port heads?
Everything you have now will bolt up. No fancy intake or manifolds needed. They are already set up for unleaded gas. And they flow better then the old 318 heads.
Magnum heads are better but if you are keeping the motor stockish i dont think they are worth all the extra crap you have to do to make them fit.
You must keep things in perspective, you're only feeding 318 cubic inches, you don't need a real high CFM head, leave those for the 408 stroker crowd. Pocket ported 302's with a 1.88 intake would be the way I'd go.
302's don't flow any better than open chambered 318 heads. they'll give you a better combustion chamber, hardened seats, and maybe 1/3-1/2 point compression boost, but heavily worked with 2.02's, they flow about the same on the intake (and worse on the exhaust) than factory magnums. not worth the trouble, IMHO
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: Old 318 with new magnum heads...yay or nay?
[Re: Dakota_Don]
#1180343
02/27/12 10:47 PM
02/27/12 10:47 PM
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Joined: Jul 2003
Posts: 394 Tennessee
classof65
enthusiast
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enthusiast
Joined: Jul 2003
Posts: 394
Tennessee
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I think Patrick needs to speak with Donnie Quinn about whether or not the 302 head flows the same as the other 318 stuff. Much of the "advantage" of the Magnum heads is due to the 1.6 rocker ratio. Let's look at this another way. Find a set of 315 castings (273) have a decent valve job and install them. The port velocity will more than make up for the volume increase of the magnum. Anyone out there got a 318 with magnums in a 74 - 76 A body? What's your ET and what kind of fuel do you have to run?
Just built a .030 over 318 with Sealed Power (el cheapo) pistons, I used the .411 - .399 stock eliminator cam out of our U/SA car, a set of 315 casting heads, a 273 HP cast iron intake, and a quick fuel 650 carb. ET 12.28 on regular pump gas. Granted it's got some gear, but that 75 Dart is HEAVY....
What I am saying is, there are several routes to the same destination, take the path with the least resistance. Oh, by the way, the valves are STOCK DIAMETER 273 jobs....
Peace, Rev. Mopar (Class of 65, 32 time National Record holder in U/SA)
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