Original 360 vs 5.9 magnum to build
#1652091
07/28/14 03:23 PM
07/28/14 03:23 PM
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Joined: Apr 2007
Posts: 2,920 Calgary, Alberta Canada
a12rag
OP
master
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OP
master
Joined: Apr 2007
Posts: 2,920
Calgary, Alberta Canada
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I am thinking that after 70k + miles, and having oil consumption going up, and perhaps a weak cylinder, it is time to look at the E58 360 in my 74 Duster360. It is the original engine, rebuilt 70k+ miles ago, can't recall what went into it, pretty much all stock.
I love to drive this car, long distance, etc . . . so, do you guys think another stock rebuild would be the way to go ?? Or get a 5.9 magnum and rebuild it (maybe even stroked ??) . . . I do like the "go", but also like having a smooth idle and some sort of mpg ! Would also like to keep the exhaust I have on the car - factory manifolds, right side the the Y style off a 340 and left is the 360 factory manifold. Stock 727 and 8.25 rear (still has the 2.45:1 gears - even the tired 360 cranks the tires over !!! And pulls 22mpg at 70mph) . . . . .
Just interested to see what is happening out there these days, and what your thoughts would be. . .
Thanks,
Mark
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Re: Original 360 vs 5.9 magnum to build
[Re: a12rag]
#1652093
07/28/14 03:54 PM
07/28/14 03:54 PM
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Joined: Jan 2005
Posts: 4,441 Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,441
Michigan
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I would use a late model LA block or Magnum for the next build to be able to use a roller cam. The LA blocks from 89 to 92 I believe had provisions for roller cams and all Magnum motors had them. A roller would give you a nicer idle with a bit more aggressive profile than a comparable flat tappet. Magnums have the added benefit of coming with a superior head.
If you don't plan on going much over 300HP I would keep the factory manifolds for the ease of working on it, ground clearance and quietness. Much over 300HP though and you start to leave a lot on the table without them.
1987 Fifth Avenue - 512/518/D60
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Re: Original 360 vs 5.9 magnum to build
[Re: MarkZ]
#1652095
07/28/14 04:09 PM
07/28/14 04:09 PM
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Joined: Apr 2007
Posts: 2,920 Calgary, Alberta Canada
a12rag
OP
master
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OP
master
Joined: Apr 2007
Posts: 2,920
Calgary, Alberta Canada
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Thanks for the input - yes those are mpg for imperial gallon, not US. If I was to stroke out the 5.9 magnum, I would probably look at headers and different exhaust . . . keeping the 5.9 magnum, relatively stock would certainly be better than the LA, I was thinking . . . and of course keep the original engine tucked away . . .
The MPG concern isn't so much for what it gets, rather, how many miles I can go between fill ups, as the Duster has a small tank !!!
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Re: Original 360 vs 5.9 magnum to build
[Re: can.al]
#1652100
07/29/14 01:01 AM
07/29/14 01:01 AM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Heads, intake, pushrods, rockers, cover the requirements. You can redrill the heads to accept an LA intake, someone on Moparts had a jig that got passed around years ago just for this. You may, or may not, need to replace the lifters for oil thru the pushrods, you will have to look and see to know. LA valve covers can work on a Magnum head, just pay attention to fitment as they are not identical. Exhaust manifolds/headers should bolt up for the most part. If you have air injection manifolds you might have an issue there.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Original 360 vs 5.9 magnum to build
[Re: Supercuda]
#2446899
02/05/18 03:40 PM
02/05/18 03:40 PM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
master
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master
Joined: Feb 2003
Posts: 7,982
Scranton, PA
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Neither the magnum block, nor the LA block have provisions for a fuel pump.
Incorrect, the LA TBI motors did have a long snout cam with the pump eccentric with a block off plate. This changed on some 318s so you have to check before you buy - later cams used a spacer instead of the eccentric (can just swap out) or went to a cam without the provision. AFAIK the 360s all came with the long snout cam and eccentric up until phase out for the magnums.
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Re: Original 360 vs 5.9 magnum to build
[Re: a12rag]
#2446934
02/05/18 04:39 PM
02/05/18 04:39 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Neither the magnum block, nor the LA block have provisions for a fuel pump.
Incorrect, the LA TBI motors did have a long snout cam with the pump eccentric with a block off plate. This changed on some 318s so you have to check before you buy - later cams used a spacer instead of the eccentric (can just swap out) or went to a cam without the provision. AFAIK the 360s all came with the long snout cam and eccentric up until phase out for the magnums. Ah, the old Moparts illiteracy program. Let me clarify for you. Neither the magnum block, nor the LA block have provisions for a fuel pump. As Foghorn Leghorn would say, pay attention son, I say pay attention. Someone in the thread claimed the magnum block had no provisions for a fuel pump. No [censored] sherlock, none of them do, that's not where the fuel pump mounts.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Original 360 vs 5.9 magnum to build
[Re: dogdays]
#2446962
02/05/18 05:45 PM
02/05/18 05:45 PM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
master
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master
Joined: Feb 2003
Posts: 7,982
Scranton, PA
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Count on Montclaire to resurrect a 3 1/2 year old post to give a wrong answer!
R. Who are you again?
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Re: Original 360 vs 5.9 magnum to build
[Re: a12rag]
#2447199
02/06/18 12:38 AM
02/06/18 12:38 AM
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Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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my 88 318 tbi has been converted to carb and mechanical fuel pump..I removed the blocking plate and installed a pump...
Tony
70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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