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290 vs 343 flywheel?? |
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Steve_P 
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Charter Member Joined: Jun/28/2007 Status: Offline Points: 3806 |
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 Topic: 290 vs 343 flywheel??Posted: Jan/17/2019 at 6:54pm |
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Ideally, you want to use a 343 flywheel on the 343 or they will have to add weight. It's cheaper to remove weight than add.
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SC397
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Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
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Posted: Jan/14/2019 at 7:13am |
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Yes, they are all indexed in the same position. Here is a picture of the other side. http://rebsamcandjeep.proboards.com/thread/585/amc-290-401-flywheels-flexplates
Edited by SC397 - Jan/14/2019 at 7:16am |
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knightflight
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Joined: Jan/30/2014 Location: Nor. Calif. Status: Offline Points: 433 |
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Posted: Jan/13/2019 at 8:13pm |
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SC397...
It appears the flywheels you have pictured are all indexed in the same mount position, right? I see the red marks at the 7 o'clock hole on each one. I assume that is why those are there. The pics helps a lot, thank you. Walt |
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'68 Rebel SST coupe. (X2) '69 SC/Rambler (#7 on registry) '69 Javelin SST Go-Pak 390-4 speed '70 Rebel Machine 4spd '72 Javelin AMX 360 ram-air |
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SC397
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Posted: Jan/13/2019 at 8:07pm |
Same here.
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401MATCOUPE
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Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Posted: Jan/13/2019 at 6:44pm |
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Walt, you are absolutely correct, I have never had a AMC vib after rebuild/rebalance, I do everyone, same shop...over 100 of them now.
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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purple72Gremlin
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Posted: Jan/13/2019 at 5:51pm |
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make sure the machine shop understands that the AMC v8 is externally balanced. I paid a machine shop to balance my one 360 with a 304 flywheel and balancer....it still vibrated..total waste of my money.
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knightflight
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Joined: Jan/30/2014 Location: Nor. Calif. Status: Offline Points: 433 |
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Posted: Jan/13/2019 at 5:20pm |
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Hey guys, thanks for the informative input. So, from all that, it looks like I CAN use either one, as long as I am having it balanced with an engine rebuild...correct?
Walt |
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'68 Rebel SST coupe. (X2) '69 SC/Rambler (#7 on registry) '69 Javelin SST Go-Pak 390-4 speed '70 Rebel Machine 4spd '72 Javelin AMX 360 ram-air |
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pacerman
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Joined: Jul/03/2007 Location: United States Status: Offline Points: 9057 |
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Posted: Jan/13/2019 at 8:41am |
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Anecdotal I'm sure: I am finally assembling my 343 factory short block for my AMX. I could not find a 343 flywheel but I did find a NORS Scheiffer 40-pound flywheel with the correct part number for a 343. I had the whole assembly precision balanced as recommended by the Scheiffer literature. The balance shop in Gilroy said it was 52 grams out of balance so I'm glad I did it. Joe
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Happiness is making something out of nothing.
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SC397
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Posted: Jan/13/2019 at 8:04am |
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Upper left is a 290 flywheel. Upper right is a 343 flywheel. The only visual difference is the balancing holes that were drilled in to the 343 flywheel (bottom area of the flywheel)
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401MATCOUPE
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Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Posted: Jan/13/2019 at 5:04am |
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the balance is different, remember the balance is done with all rotative components...yes the crank is the same and so are rods/rod bearings.....BUT different pistons, rings and front dampener. The raw casting would be the same, but if you are trying to swap, it needs to come from know engine size. If you are rebuilding and re-balancing anyway......you can use either in the initial balance and it will be adjusted (adding and subtracting weight)
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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401MATCOUPE wrote: