'71 340 balancer with forged crank

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stevndar

stevndar

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In my '69 Dart, 340 ('71), 4 speed I have vibration at about 2000 RPM sitting still and I think I may have an incorrect balancer. I'm wandering if the previous owner may have installed the wrong one. I rebuilt with same pistons and crank (forged). Can someone show me a picture, diagram or explain what the correct balancer looks like? I know the balancer for a cast crank is marked as such. Thanks for any help or suggestions you can give.
 

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From the picture it looks like you have one for an externally balanced engine. If you have a forged steel crank then you need a balancer that doesn't have the offset weight that you can see in the picture.

Ken
 
My 71 360 has that same balancer on it and I believe it is also a forged crank. wonder if that's why it spun a bearing.
 
That balancer is wrong unless the rotating *** is balance with it. I wound bet its just wrong. That balancer is for a cast crank are you sure yours is forged?
 
318 balancers are the same so any one of them or a 68-72 340 balancer will work. The 360 and the 73 cast crank balancers will NOT work.

Ken
 
stevndar said:
In my '69 Dart, 340 ('71), 4 speed I have vibration at about 2000 RPM sitting still and I think I may have an incorrect balancer. I'm wandering if the previous owner may have installed the wrong one. I rebuilt with same pistons and crank (forged). Can someone show me a picture, diagram or explain what the correct balancer looks like? I know the balancer for a cast crank is marked as such. Thanks for any help or suggestions you can give.
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You sure it's a 340 ? And are you sure of the year , late 72 could have a cast crank , or it might have been replaced with a cast crank by a previous owner , have seen that done a few times .
Unless you built and inspected it make sure you have the right parts .
 
Looks like a 71 360 balancer. Get a 340 or 318 balancer. Also check torque convertor for weights and flexplate for odd cutouts. That balancer alone would easily mess up your balance.
 
Thanks everyone. I thought it appeared to be a 360 balancer. Crank is forged, see photo.
 

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66fs said:
Looks like a 71 360 balancer. Get a 340 or 318 balancer. Also check torque convertor for weights and flexplate for odd cutouts. That balancer alone would easily mess up your balance.
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My cousin had several balancers and we found the correct one for 340. Thanks for all helpful comments. She runs fine. :blob:
 

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