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1970 390 flexplate |
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69amxr
AMC Apprentice Joined: Jun/23/2011 Location: MI Status: Offline Points: 119 |
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One more question along this same line. Is the flex plate from a '69/390 the same as the flex plate for a '70 390? are they interchangeable?
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amx39068
Supporter of TheAMCForum Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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they are different
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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69amxr
AMC Apprentice Joined: Jun/23/2011 Location: MI Status: Offline Points: 119 |
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thanks for the confirmation. I am assuming they are balanced differently. My AMX has a 1970 service replacement engine and I am guessing they used the original 1969 flex plate as I have a noticable vibration at highway speeds. I have narrowed the source down to the trans or flex plate.
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amx39068
Supporter of TheAMCForum Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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I had two 68/69 service replacement blocksm one NOS and one used, and both had the correct 68/69 deck height, were balanced correct for the 68/69 model year and had the correct pistons, rods and crankshaft for 68/69. The 70 service replacement block was a different block and used the taller block for all ther 70 390 and 401s but should have the correct internals for whatever years it replaced.
What may be your case however is that someone unknowingly used a later service replacement block that was not correct for your year at some time in the car's life and swapped the earlier balancer and flex plate without realizing they are different than the ones that go with the earlier engines. For all you know, you could have a 401 lurking under the hood and the only way to tell is to pull it out and drop the pan to see what crankshaft and rods are actually in the block. |
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5121 |
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Are they? The flexplate from my '70 Machine looks the same as the one from my '69 AMX.
-Steve-
Edited by Rebel Machine - May/09/2012 at 8:46pm |
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