360 swap?
#3178530
09/27/23 06:17 AM
09/27/23 06:17 AM
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Joined: May 2016
Posts: 630 Ct
Wirenut
OP
mopar
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OP
mopar
Joined: May 2016
Posts: 630
Ct
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Have been thinking about swapping a 360 magnum into our 65 b body . It currently has a mostly stock 70 340. The 340 is getting a bit tired . The only reason I was thinking 360 is so I could rebuild and have an engine ready to put in . Was considering aluminum heads and a Holley fi system. An engine has recently come available . It’s a 2000 360 magnum with EQ heads a cam and dual plane manifold. It’s fairly cheap at $600. Although the heads are ci maybe this is a good base for a build ? Looking for 375-400 hp . Is that realistic with either engine with a stock lower end ?
Thoughts ?
Last edited by Wirenut; 09/27/23 09:00 AM.
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Re: 360 swap?
[Re: Wirenut]
#3178622
09/27/23 01:39 PM
09/27/23 01:39 PM
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Joined: Jan 2005
Posts: 4,446 Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,446
Michigan
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Have been thinking about swapping a 360 magnum into our 65 b body . It currently has a mostly stock 70 340. The 340 is getting a bit tired . The only reason I was thinking 360 is so I could rebuild and have an engine ready to put in . Was considering aluminum heads and a Holley fi system. An engine has recently come available . It’s a 2000 360 magnum with EQ heads a cam and dual plane manifold. It’s fairly cheap at $600. Although the heads are ci maybe this is a good base for a build ? Looking for 375-400 hp . Is that realistic with either engine with a stock lower end ?
Thoughts ? Sounds good. That motor will slip right in. The Magnum motors still have the LA mounting ears cast into the block and I believe the ear spacing on them is the same as 340/360 LA motors. Only thing you need to worry about is balance and that can be solved with a B&M flex plate. I don't know if the EQ heads have the same issue with high lift cams as the factory Magnum heads. Factory heads needed the spring seats machined to allow for cams with more than .520" valve lift. And make sure it has a center sump oil pan. It's really a straightforward swap.
1987 Fifth Avenue - 512/518/D60
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Re: 360 swap?
[Re: d-150]
#3178626
09/27/23 01:45 PM
09/27/23 01:45 PM
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Joined: Jan 2003
Posts: 20,699 Eagle, Idaho
Neil
The Doctor is in.
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The Doctor is in.
Joined: Jan 2003
Posts: 20,699
Eagle, Idaho
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Magnum has a roller cam, which is good since so many are having trouble with flat tappet lifters these days. Magnum has no mechanical fuel pump provision, which is a negative for those wanting a mechanical fuel pump. I think the engine mounts are different between 340 and 360 blocks on the driver's side, but that is not a big deal. Personally I would skip the EFI and spend that money on a 4" crankshaft instead. Even a mild 4" crank engine with good heads and a modest camshaft would provide a lot more bottom and mid range power for street driving. https://youtu.be/nbY7UGuZAfA?si=P9a1juyaBYOszh8F
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Re: 360 swap?
[Re: d-150]
#3178679
09/27/23 03:49 PM
09/27/23 03:49 PM
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Joined: Jan 2005
Posts: 4,446 Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,446
Michigan
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Only early blocks have la mounts.. You will need oil pan and torque converter for balancing issue. You will have about a grand in all parts .two thirds to a 416 stroker kit for your 340 I've pulled 2000 model year Magnums with the ears on them. Are you sure about that? And there is no need to replace the TQ if it stills stalls in the desired range for the application. Balancing is solved with just the correct flex plate. Take a look at that 5.9L. Check for the ears, a center sump oil pan and a timing cover with provisions for a mechanical pump (look inside for the pump eccentric). If it checks all those boxes and you plan on taking your time with the 340 do it. You can always sell it later on too.
Last edited by MarkZ; 09/27/23 03:59 PM.
1987 Fifth Avenue - 512/518/D60
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Re: 360 swap?
[Re: d-150]
#3178711
09/27/23 05:36 PM
09/27/23 05:36 PM
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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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Damn. My '91 360 had no fuel pump provision, I had to add a camshaft with the snout and the eccentric. Different deck heights? NOT. Mains are larger. Magnum heads and exhaust manifolds are worth the swap alone. Note the 360 Magnum external balance is NOT the same as the older 360's.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: 360 swap?
[Re: d-150]
#3178773
09/27/23 07:23 PM
09/27/23 07:23 PM
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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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He is buying aluminum heads Icing on the cake.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: 360 swap?
[Re: topside]
#3178831
09/27/23 08:56 PM
09/27/23 08:56 PM
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Joined: Jan 2003
Posts: 10,614 Freeport IL USA
poorboy
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,614
Freeport IL USA
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These guys love spending other people's money.
If either motor is going to get rebuilt before the car gets used, and you add aluminum heads and the efi, any advantage the 340 may have had is pretty much gone. Then if you add the 4" crank kit, any engine balance issue should be the same for both motors.
Then the choice between the two motors becomes pretty much just a matter of costs of the same build between the 2 motors, (which are going to end up pretty close to the same HP. The 360 purchase has to be included in that price comparison). Then consider the bragging rights that come along with the 340 (which is mostly just a donor block at this point, and most younger guys won't understand what makes the 340 special), and which motor build best fits the time frame for driving the car. With both motors built with pretty much the same parts, the differences between the two is going to be pretty small.
Assuming the car runs and moves as it is, building the 360 while still driving the car may be worth whatever the cost difference may be. If you rebuild the 340, the car is down until all the parts show up and the 340 can be assembled, which could have a pretty questionable time frame these days. With rebuilding the 340, the car may well sit out some or all of next summer's driving enjoyment. At the same time, if you build the 360, and if it doesn't get done before next summer, you can still drive the car next summer. That would be a big part of my consideration.
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Re: 360 swap?
[Re: poorboy]
#3178834
09/27/23 09:02 PM
09/27/23 09:02 PM
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Joined: Jan 2003
Posts: 20,841 A collage of whims
topside
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,841
A collage of whims
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^^^ That was my point, though you've elaborated on it better. What I don't know, of course, is the OP's budget, how "tired" the 340 is, how he uses the car, etc. So, I'm just spit-balling, with an eye on down-time and bottom line.
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Re: 360 swap?
[Re: d-150]
#3179028
09/28/23 04:28 PM
09/28/23 04:28 PM
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Joined: May 2019
Posts: 6,291 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,291
nowhere
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Early magnums had mech. Pump provision later didn't. Flexplate costs more then conv. So going as far as pulling motor I would want new conv. It's a wear item.also deck height issues 360 is an inch taller so check exhaust for clarence.if starting from scratch I would go magnum but since he already has a motor that is capable of 400 hp i would go with what you got If he's going to run the 340 accessories he will need the 340 style timing cover and there is your mechanical fuel pump provisions, lol. Just make sure the cam has the ling snout or you get the adapter. This is really a non-issue especially since he's talking about going EFI. Taller deck height? Try again, same deck height. He will need a pass car style oil pan.
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