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Magnum Engine in 68 A body #999738
05/25/11 04:47 PM
05/25/11 04:47 PM
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DC, MD Suburbs
440PURSUIT Offline OP
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What mounts/exhaust/major concern to replace an LA 318? I know that the Carbureted intake can be expensive.

Tech article available?

THanks

Re: Magnum Engine in 68 A body [Re: 440PURSUIT] #999739
05/25/11 05:08 PM
05/25/11 05:08 PM
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Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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I think the balance is diff so flex plate/tc and you need a LA timing cover and the Hughes' front cam adapter to run a mech fuel pump (it's dirt cheap). Prob more but this'll get you started


live every 24 hour block of time like it's your last day on earth
Re: Magnum Engine in 68 A body [Re: 440PURSUIT] #999740
05/25/11 05:09 PM
05/25/11 05:09 PM
Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan Offline
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Quote:

What mounts/exhaust/major concern to replace an LA 318? I know that the Carbureted intake can be expensive.

Tech article available?

THanks




Same rules apply for 5.2/5.9 mounts as 318/360

a 5.2 will slip in the same spot as a 318 with no to little issues, I have a 5.9 in my Duster.

Intakes can be tricky but there is lots of options out there.

Re: Magnum Engine in 68 A body [Re: gdonovan] #999741
05/25/11 09:14 PM
05/25/11 09:14 PM
Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish Offline
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Maryland
if you are handy, and have access to both Magnum and LA heads, its not that hard to make your own jig and cross drill the magnum heads to accept any LA intake.


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
Re: Magnum Engine in 68 A body [Re: RapidRobert] #999742
05/25/11 09:19 PM
05/25/11 09:19 PM
Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan Offline
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Quote:

I think the balance is diff so flex plate/tc and you need a LA timing cover and the Hughes' front cam adapter to run a mech fuel pump (it's dirt cheap). Prob more but this'll get you started




5.2 and 318 the same as far as balance, 360 and 5.9 are different.

See this thread for 360/5.9 info-

https://board.moparts.org/ubbthreads/show...t=1#Post6068818

Re: Magnum Engine in 68 A body [Re: gdonovan] #999743
05/25/11 09:28 PM
05/25/11 09:28 PM
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383 Offline
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yup, 5.2L magnums are internal/zero balance. the 5.9s are external, and a different balance factor than the LA360s.

there's a cheaper carb intake out there, it's not a name brand, but it's a copy of an Eddy RPM airgap, 4bbl carb intake (no bosses drilled for injectors) and comes with a dual bolt pattern for both LA and Magnum style heads. not well marketed, being non-name brand, but I saw a few on Ebay.


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Re: Magnum Engine in 68 A body [Re: 70Cuda383] #999744
05/25/11 11:03 PM
05/25/11 11:03 PM
Joined: Feb 2003
Posts: 8,658
A
Andrewh Offline
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I installed one in a 65 coronet.
not quite as small as an abody, but pretty tight as space goes.

my 318 came with a 727.
b&m makes a weighted flex plate that lets you run the neutral balanced torque converter, so I kept my 318 torque converter etc..

the 5.9 uses the 360 mounts like the la block and it has the truck mouting tabs.
I picked up a conversion set from schumakers(sp).

The pan is the standard 360 LA car pan. Got mine new from mopar. Several places still sell it with the pickup and dip stick.

I found the dip stick it came with did not work as well, so reused the magnum one.

I used the durango truck exhaust. Cleared pretty much everything. I did wrap it near the speedo cable and cable shifter.

Personally I would go electric fuel pump and keep the serpintine belt setup but that is just me. IF you do that, find a van for the power steering pump or it will wind up under the battery tray.

Re: Magnum Engine in 68 A body [Re: 440PURSUIT] #999745
05/26/11 01:16 AM
05/26/11 01:16 AM
Joined: Dec 2004
Posts: 1,545
DC, MD Suburbs
440PURSUIT Offline OP
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440PURSUIT  Offline OP
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Thanks, all!

Good info.


1969 Hemi Charger R/T,
1970 Charger 472 Hemi 6 Sp
1969 Charger Pro Tour Project
1971 Barracuda Convert
1970 440 6pack Superbird,
1968 Fury I Police Pursuit 440 Super Commando 2 door sedan (Black/Blue)
1967 Barracuda Convert
1968 Barracuda Coupe
1972 Charger w 383
1972 Sebring Plus 440-6 Clone
1969 Coronet Pro Street
2009 Challengeer SRT8 stick
1992-1986 Body 2500 4x4 440 stick
1982 Ramcharger 318 Sniper- getting enhanced.
1997 Ram B3500 Van 5.9
1991.5 W250 Cummins- Big Chief
Re: Magnum Engine in 68 A body [Re: 440PURSUIT] #999746
05/26/11 02:02 AM
05/26/11 02:02 AM
Joined: Mar 2003
Posts: 18,677
Fresno, CA
Jim_Lusk Offline
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In my opinion, there's not enough to gain unless you keep the fuel injection and computer management. Otherwise, simple hop-up stuff to the 318 you already have will suffice.

Re: Magnum Engine in 68 A body [Re: Jim_Lusk] #999747
05/26/11 02:23 AM
05/26/11 02:23 AM
Joined: Feb 2003
Posts: 1,665
Milwaukee, WI
Prince_Valiant Offline
top fuel
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Milwaukee, WI
Quote:

In my opinion, there's not enough to gain unless you keep the fuel injection and computer management. Otherwise, simple hop-up stuff to the 318 you already have will suffice.


Better heads and roller cam...will perform as well or better than a simple hopped-up LA engine while the magnum is mostly stock.

I ran a stock 360 magnum (aside from intake), with stock 1979 manifolds and ran 15.1 @ 91 mph in the little red truck. Using a hughes roller cam (mild one at that) and headers and it felt like a completely different truck...low 14's probable. A similarly hopped up LA probably would have been only a little quicker than the stock-ish magnum was...


1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph
1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD)
1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD)
1989 Shelby CSX #500/500
Re: Magnum Engine in 68 A body [Re: Prince_Valiant] #999748
05/26/11 03:07 AM
05/26/11 03:07 AM
Joined: Mar 2003
Posts: 18,677
Fresno, CA
Jim_Lusk Offline
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Fresno, CA
Quote:

Quote:

In my opinion, there's not enough to gain unless you keep the fuel injection and computer management. Otherwise, simple hop-up stuff to the 318 you already have will suffice.


Better heads and roller cam...will perform as well or better than a simple hopped-up LA engine while the magnum is mostly stock.

I ran a stock 360 magnum (aside from intake), with stock 1979 manifolds and ran 15.1 @ 91 mph in the little red truck. Using a hughes roller cam (mild one at that) and headers and it felt like a completely different truck...low 14's probable. A similarly hopped up LA probably would have been only a little quicker than the stock-ish magnum was...




I don't think 15.1 is that much better than stock for an LRT, but I could be mistaken. I'd throw an LA 360 in place of a 318 before I'd go for the same cubes in a swap. I've done a 318 Magnum swap, but it was all the way with the injection and overdrive auto AND it didn't cost me anything. I'd do that again if given the chance, but not without the injection.

Re: Magnum Engine in 68 A body [Re: 440PURSUIT] #999749
05/26/11 08:35 AM
05/26/11 08:35 AM
Joined: Dec 2004
Posts: 1,545
DC, MD Suburbs
440PURSUIT Offline OP
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440PURSUIT  Offline OP
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Got my LA 318 running well on stand. Has a burnt/bad exhaust valve on #8 per leakdown and an oil soaked plug on #7. Don't want to get into machining cost. I do have fresh heads but will first run the engine more to reseat rings and further evaluate.

I'm searching local ads on Craigslist for 360's. They come up but got stiffed a couple times!

Re: Magnum Engine in 68 A body [Re: Jim_Lusk] #999750
05/26/11 08:50 AM
05/26/11 08:50 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
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Brookeville, Md
Quote:

In my opinion, there's not enough to gain unless you keep the fuel injection and computer management. Otherwise, simple hop-up stuff to the 318 you already have will suffice.




nah the roller set-up and much better heads make it a no-brainer. Even w/ a small 4bbl it should run much better than a stockish 69 318.


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Coming soon!!!!
Re: Magnum Engine in 68 A body [Re: 440PURSUIT] #999751
05/26/11 08:58 AM
05/26/11 08:58 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Quote:

I do have fresh heads but will first run the engine more to reseat rings and further evaluate.


This 5 minute read may (or may not) help you. "breakin secrets" at www.mototuneusa.com. Scroll down till you see it & click on it


live every 24 hour block of time like it's your last day on earth
Re: Magnum Engine in 68 A body [Re: Jim_Lusk] #999752
05/26/11 10:30 AM
05/26/11 10:30 AM
Joined: Feb 2009
Posts: 892
Illinois
StrkrDart69 Offline
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Much easier to find magnums, and a roller cam and better heads on the magnum. I have a magnum in a 69 Dart and it was no problem to put in.

Re: Magnum Engine in 68 A body [Re: Jim_Lusk] #999753
05/26/11 10:35 AM
05/26/11 10:35 AM
Joined: Feb 2003
Posts: 1,665
Milwaukee, WI
Prince_Valiant Offline
top fuel
Prince_Valiant  Offline
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Posts: 1,665
Milwaukee, WI
Quote:

Quote:

Quote:

In my opinion, there's not enough to gain unless you keep the fuel injection and computer management. Otherwise, simple hop-up stuff to the 318 you already have will suffice.


Better heads and roller cam...will perform as well or better than a simple hopped-up LA engine while the magnum is mostly stock.

I ran a stock 360 magnum (aside from intake), with stock 1979 manifolds and ran 15.1 @ 91 mph in the little red truck. Using a hughes roller cam (mild one at that) and headers and it felt like a completely different truck...low 14's probable. A similarly hopped up LA probably would have been only a little quicker than the stock-ish magnum was...




I don't think 15.1 is that much better than stock for an LRT, but I could be mistaken. I'd throw an LA 360 in place of a 318 before I'd go for the same cubes in a swap. I've done a 318 Magnum swap, but it was all the way with the injection and overdrive auto AND it didn't cost me anything. I'd do that again if given the chance, but not without the injection.


Well, the "stock" engine in an LRT though isn't quite what we consider "stock bread n' butter" LA engine per se.

Don't forget that the stock 360's used a hotter cam of which approximated a "340 cam" (~212-218 @ .050) to get to the 225 net HP. While the cam in the magnum was indeed the stock roller cam that is sub 190 @ .050 in size....the cam I upgraded to was not even as large at .050 than the stock cam typically found in the e58 engine in lrt's...

But for the record, most of the stock lrt's I've seen for 79's were typically in the mid 15's....but in effect, the stock e58 represents you're typical mildly hopped up 360 w/o headers...I think an e58 w/ headers would have been a close match, but mine w/ the same headers and equivalent sized cam at .050, it'd be no contest.



1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph
1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD)
1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD)
1989 Shelby CSX #500/500
Re: Magnum Engine in 68 A body [Re: Prince_Valiant] #999754
05/26/11 12:14 PM
05/26/11 12:14 PM
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383 Offline
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magnum 5.9L, stock cam, heads, pistons, carb intake, headers, and they make what...300 hp? that's the combo for the 300hp crate motors, right?

bump the compression with either flat top pistons or shave the heads, add a cam, and you have the recipie for the 385hp crate motors.

so...a 385hp small block for the cost of a junkyard 5.9L magnum out of a wrecked 01 Durango, and a cam swap. I built mine for $1000. $500 for the motor and head shave job, and the roller cam, springs, retainers.


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Re: Magnum Engine in 68 A body [Re: Prince_Valiant] #999755
05/26/11 06:05 PM
05/26/11 06:05 PM
Joined: Aug 2007
Posts: 1,819
Middle of A Field
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OrangeProwler Offline
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Middle of A Field
Quote:

Quote:

Quote:

Quote:

In my opinion, there's not enough to gain unless you keep the fuel injection and computer management. Otherwise, simple hop-up stuff to the 318 you already have will suffice.


Better heads and roller cam...will perform as well or better than a simple hopped-up LA engine while the magnum is mostly stock.

I ran a stock 360 magnum (aside from intake), with stock 1979 manifolds and ran 15.1 @ 91 mph in the little red truck. Using a hughes roller cam (mild one at that) and headers and it felt like a completely different truck...low 14's probable. A similarly hopped up LA probably would have been only a little quicker than the stock-ish magnum was...




I don't think 15.1 is that much better than stock for an LRT, but I could be mistaken. I'd throw an LA 360 in place of a 318 before I'd go for the same cubes in a swap. I've done a 318 Magnum swap, but it was all the way with the injection and overdrive auto AND it didn't cost me anything. I'd do that again if given the chance, but not without the injection.


Well, the "stock" engine in an LRT though isn't quite what we consider "stock bread n' butter" LA engine per se.

Don't forget that the stock 360's used a hotter cam of which approximated a "340 cam" (~212-218 @ .050) to get to the 225 net HP. While the cam in the magnum was indeed the stock roller cam that is sub 190 @ .050 in size....the cam I upgraded to was not even as large at .050 than the stock cam typically found in the e58 engine in lrt's...

But for the record, most of the stock lrt's I've seen for 79's were typically in the mid 15's....but in effect, the stock e58 represents you're typical mildly hopped up 360 w/o headers...I think an e58 w/ headers would have been a close match, but mine w/ the same headers and equivalent sized cam at .050, it'd be no contest.






A stock LRT will run 15.8 to 15.9 in the 1/4 mile.
Sometimes a little slower. I've seen a couple in the 16.0 range.

Questions? Help! [Re: 440PURSUIT] #999756
05/27/11 07:18 PM
05/27/11 07:18 PM
Joined: Dec 2004
Posts: 1,545
DC, MD Suburbs
440PURSUIT Offline OP
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OK. Bought a fresh rebuilt 5.2 Magnum Longblock from a 95 Truck. Got it for $400. Its going in a 68 B'Cuda Notch.

Is this engine Internal or external balance?
What Torque Converter to use?

I plan to Carburate. I saw the $165 Intake on Ebay.

Should I change cam? Its has the fuel injection cam so may have short duration on intake?

Thoughts?


Thanks

Last edited by 440PURSUIT; 05/27/11 07:19 PM.
Re: Questions? Help! [Re: 440PURSUIT] #999757
05/31/11 01:20 PM
05/31/11 01:20 PM
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
patrick Offline
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Grand Haven, MI
5.2 is internally balanced.

the $165 intake is a professional products crosswind. OK mani, I'd go for a eddie magnum air gap.

get the stock roller cam reground by bullet cams using their HR259/316 lobe for intake and exhaust, and use hughes #1110 springs with their retainers. you should be able to maintain the stock pushrods and rockers (at least I was able to)


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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