Flexplate interchange for 455 - ClassicOldsmobile.com


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Old December 5th, 2012, 08:20 PM   #1
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Flexplate interchange for 455

Forgive me if this is a stupid question, but will a Pontiac Flexplate interchange with an Olds 455? I'm asking because I'm trying to use the convertor I have with the 4L80 I picked up while I test and tune the car. I thought with the Pontiac having the 6 pad flexplate it would help a great deal. I'm going to have a convertor built, but the won't be right away.
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Old December 5th, 2012, 09:12 PM   #2
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I can't answer your question but it would help if you had an Olds flexplate to compare it to. Remember, it is more than just seeing if the bolts line up. The flexpate is counter balanced to the engine rotating assembly, so if the weights are in a different spot or are heavier on one side it won't work.
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Old December 6th, 2012, 04:19 AM   #3
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No, you need a 68 and up Olds flexplate.
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Old December 6th, 2012, 07:43 AM   #4
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No, you need a 68 and up Olds flexplate.
OK, thanks. I already have one of those. I think I'll move my converter up in my list of priorities.

Last edited by csouth; December 6th, 2012 at 08:32 AM.
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Old December 6th, 2012, 09:33 AM   #5
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OK, thanks. I already have one of those. I think I'll move my converter up in my list of priorities.
If your only concern is the six-bolt converter, just drill the extra holes in the flexplate. The converter is located by the pilot in the crank, not the bolts.
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Old December 6th, 2012, 11:24 AM   #6
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If your only concern is the six-bolt converter, just drill the extra holes in the flexplate. The converter is located by the pilot in the crank, not the bolts.
I was under the impression that all the holes needed to be bolted, but now I see where some Buick guys have used only 3 of the 6 bolts. It'll only be until I get my converter done anyway.

Last edited by csouth; December 7th, 2012 at 04:52 AM.
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Old December 7th, 2012, 04:34 AM   #7
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Three bolts will be fine. That's all I have and I beat on it pretty hard. Just make sure to use some good ARP bolts or compareable.
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Old December 7th, 2012, 04:53 AM   #8
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Three bolts will be fine. That's all I have and I beat on it pretty hard. Just make sure to use some good ARP bolts or compareable.
The flexplate to crank bolts are, I'll make sure I do the same for the converter.
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