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5.9 magnum flywheel #2883313
02/02/21 09:42 PM
02/02/21 09:42 PM
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upstate western ny
sogtx Offline OP
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Where in heck can i find an external bal flywheel for
a magnum engine..??

Re: 5.9 magnum flywheel [Re: sogtx] #2883335
02/02/21 10:01 PM
02/02/21 10:01 PM
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stock 143 tooth - Rockauto

130 tooth - mancini

Re: 5.9 magnum flywheel [Re: sogtx] #2883526
02/03/21 01:16 PM
02/03/21 01:16 PM
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I've got one you can have for $5 plus the ride.


1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
Re: 5.9 magnum flywheel [Re: jbc426] #2883555
02/03/21 02:05 PM
02/03/21 02:05 PM
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sogtx Offline OP
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So i have a 1978 casting 360
I thought it was a magnum because of the vertical
intake bolts - i guess it was in between LA and Magnum
But Im thinking it is externally balanced - which means you
need ext bal flexplate , too . If goin automatic
Im just running it on a test stand to see if she is junk or not .
Im bummed its not a real magnum . But oh well .
Next issue - will available flywheels fit my BH .

Was gonna use it to test carbs , distributors , etc . And make
noise in shop in winter .

If I can get a six pack intake that bolts up - would be great
Didn t realize heads needed re drilled

Oh well jbc if thats the flywheel I need thats weighted -
Itd be worth it - otherwise its just junk cast iron .
Thanks, Andy

A cheap modman intake on needed list too . Lol


82B3A552-4EE4-4C41-AA46-C758BB865AAA.jpeg
Last edited by sogtx; 02/03/21 02:07 PM.
Re: 5.9 magnum flywheel [Re: sogtx] #2884067
02/04/21 04:40 PM
02/04/21 04:40 PM
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Don't think those are 78 360 heads either.

I see no air injection ports below the exhaust ports. You might have a 78 360 short block with magnum heads. If it has stud mount rockers that's a clue.

Re: 5.9 magnum flywheel [Re: Sniper] #2884080
02/04/21 05:26 PM
02/04/21 05:26 PM
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Quote
I see no air injection ports below the exhaust ports.
I do not think you can see anything port wise with the gasket in place. As far as magnum goes the valve covers should be 8 bolt as far as I know.

Last edited by NITROUSN; 02/04/21 05:28 PM.
Re: 5.9 magnum flywheel [Re: NITROUSN] #2884087
02/04/21 05:43 PM
02/04/21 05:43 PM
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I just remembered something on the valve covers that the LA style will bolt on a magnum head. With the intake bolts being vertical one would have to think they are magnum. Pulling a valve cover will tell the story.

Re: 5.9 magnum flywheel [Re: NITROUSN] #2884160
02/04/21 10:37 PM
02/04/21 10:37 PM
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sogtx Offline OP
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All interesting !
Thanks for input .
I have a hodge podge.! I wonder whats inside !

Last edited by sogtx; 02/04/21 10:38 PM.
Re: 5.9 magnum flywheel [Re: NITROUSN] #2884169
02/04/21 11:12 PM
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Originally Posted by NITROUSN
Quote
I see no air injection ports below the exhaust ports.
I do not think you can see anything port wise with the gasket in place. As far as magnum goes the valve covers should be 8 bolt as far as I know.



10 bolt valve covers and the heads with air injection have an extra boss below the exhaust port that is noticeable, it is not there on the OP's heads.

Here's a pic of me cleaning out that air injection port on a 79 360




smog.jpg
Re: 5.9 magnum flywheel [Re: Sniper] #2884172
02/04/21 11:35 PM
02/04/21 11:35 PM
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Originally Posted by Sniper
Originally Posted by NITROUSN
Quote
I see no air injection ports below the exhaust ports.
I do not think you can see anything port wise with the gasket in place. As far as magnum goes the valve covers should be 8 bolt as far as I know.



10 bolt valve covers and the heads with air injection have an extra boss below the exhaust port that is noticeable, it is not there on the OP's heads.

Here's a pic of me cleaning out that air injection port on a 79 360





I realize that but I believe his picture has the gasket covering them up.

Re: 5.9 magnum flywheel [Re: NITROUSN] #2884221
02/05/21 06:59 AM
02/05/21 06:59 AM
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upstate western ny
sogtx Offline OP
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Im gonna pull the gasket and see whats up
Was wondering why they were weird shaped ..

Re: 5.9 magnum flywheel [Re: sogtx] #2884228
02/05/21 08:23 AM
02/05/21 08:23 AM
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sogtx Offline OP
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Figures the valve covers are glued on and I didn’t wanna mess with them
But - I didn’t see any air smog holes on the head

CF82FB38-766C-4E7C-B80B-00D23EA00597.jpeg
Re: 5.9 magnum flywheel [Re: sogtx] #2884229
02/05/21 08:24 AM
02/05/21 08:24 AM
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sogtx Offline OP
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Rockers are definitely studded d on

40CFB12A-030B-4393-9A7D-05AD69A16EA0.jpeg
Re: 5.9 magnum flywheel [Re: sogtx] #2884285
02/05/21 11:21 AM
02/05/21 11:21 AM
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Originally Posted by sogtx
Rockers are definitely studded d on


Not sure on the exhaust air injection holes but studs on the rockers and vertical intake bolts along with the magnum style head bolts lean towards magnum. Like I said the earlier 5 bolt cover can bolt on a magnum with the 8 hole gasket. It could be glued ti insure it does not leak. Looking at those exhaust ports has me thinking the magnum did not have the injection holes. Also that head had many other identifiable casting features that tell me it is not a pre 92 casting.

Last edited by NITROUSN; 02/05/21 11:29 AM.
Re: 5.9 magnum flywheel [Re: NITROUSN] #2884294
02/05/21 11:39 AM
02/05/21 11:39 AM
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If the engine is external balance there is a old TSB or factory bulletin that shows taking a internal balance 318 flywheel and drilling it to make it balance correctly. The bulletin showed a templet and instructions on how to exactly do it. Not knowing whats inside you might pull the pan and see what casting numbers are on the crank. What balancer does it have?

Re: 5.9 magnum flywheel [Re: NITROUSN] #2884717
02/06/21 02:11 PM
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Originally Posted by NITROUSN
Originally Posted by Sniper
Originally Posted by NITROUSN
Quote
I see no air injection ports below the exhaust ports.
I do not think you can see anything port wise with the gasket in place. As far as magnum goes the valve covers should be 8 bolt as far as I know.



10 bolt valve covers and the heads with air injection have an extra boss below the exhaust port that is noticeable, it is not there on the OP's heads.

Here's a pic of me cleaning out that air injection port on a 79 360





I realize that but I believe his picture has the gasket covering them up.


No they do not. The exhaust manifold gasket is substantially different if you have air injection ports. All that machined surface you see where I am drilling is covered by exhaust manifold gasket and there's be a big hole around the air injection port. A non-air injection gasket would not even cover where the holes are.

[Linked Image]


Last edited by Sniper; 02/06/21 02:12 PM.
Re: 5.9 magnum flywheel [Re: NITROUSN] #2884719
02/06/21 02:16 PM
02/06/21 02:16 PM
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Originally Posted by NITROUSN


Not sure on the exhaust air injection holes but studs on the rockers and vertical intake bolts along with the magnum style head bolts lean towards magnum.


There is no "lean". The Magnum head is the only factory head for the small block that has stud mounted rockers. Period.

Vertical intake bolts can be added to an LA head if someone had a reason to run a Magnum intake on one. A simple matter of drill and threading holes. So stud mounted rockers are the visual indicator here, the casting number will be a double check.

As far as getting a flywheel, your problems have just begun, lol. You may, or may not, have and LA rotating assembly, or a Magnum one. We already know someone put a Magnum top end on, it's not out of the realm of possibility that it also has a Magnum rotating assembly, which means different flywheel balance. Heck, I guess it could be internally balanced as well.

Casting numbers on the crank and rods will tell you your answer on LA or Magnum, added balance material in the crank will answer the internally balanced or not question. LA rods have a wider small end that will not fit in a Magnum piston without machine work.

Re: 5.9 magnum flywheel [Re: Sniper] #2884720
02/06/21 02:35 PM
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I agree they are magnum. It was his first picture not being real clear that you could not see if there were holes. All other evidence said they were magnum. I have seen other gaskets that can cover the hole. Here is an example. Will they cover completely I do not know or care just an example. We should be more interested as to what he can do for a flywheel.

exhaust.jpg
Re: 5.9 magnum flywheel [Re: NITROUSN] #2884848
02/06/21 07:50 PM
02/06/21 07:50 PM
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What size flywheel are you looking for? How many teeth? RockAuto has 143 tooth flywheels for pickups with 360 Magnum and LA for about $100. If you need a smaller one, you could have a 318 flywheel drilled according to the M.P. engine book. The info should be available online. I had a flywheel done for an LA 360 25 years ago, cost me $65.00 back then. I would guess it's $100 - $125 to do that today.

Re: 5.9 magnum flywheel [Re: elmor353] #2885431
02/08/21 08:55 AM
02/08/21 08:55 AM
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sogtx Offline OP
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130 tooth to use my BH
Balancer looks balanced to me ..

A8887AF4-3E18-4FAF-A6BC-54E197AC982F.jpeg561F4640-74B6-46F7-8E25-44F3DE7B6699.jpeg
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