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Old 10-09-2006, 04:11 PM
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Question about flexplate

I recently replaced the flexplate on my 400 because the teeth had chipped off the old one. I put the new one on and have the same problem. But I noticed something I had never noticed before. When I bolted up the flexplate it was flexing away from the block, which would make it difficult for the starter to engage it. So is this why its called a flexplate because it flexes? Me and my dad had never seen it do this before so we got a little concerned. So my question is is the flexplate supposed to flex away from the block? Any replies are appreciated. Thanks.

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Old 10-09-2006, 04:30 PM
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Are you sure that it isn't binding around the hub of the crank?

You should not see it flexing as you say.

Also, if it is a 400 Chevy.......you do know that a 400 Chevy uses an external balalced flywheel/flexplate?
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Old 10-09-2006, 04:33 PM
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Details...

Obviously, the chipped 'teeth' is caused by improper starter alignment. I've never heard of the flexplate 'flexing' away from the block. What do you mean? If you put the flexplate flat on a table, would the edge be off the table & only the center bolt ring contacting? Did you notice the ring gear move away from the block as you torqued the flexplate on?

Possible that the crank is not stock, and thus the end is further out than stock?

Wrong flexplate on the block before?
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Old 10-09-2006, 05:32 PM
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Its a 77 400 sbc block with an eagle forged crank, and an externally balanced flywheel mated to a 700r4 trans with a b&m 2400 stall converter. when the tourque converter is tightened down on the flexplate it pulls the flexplate away from the starter.
the converter is tight to the flexplate in the center but is about a 1/4" away at the bolt holes in the converter.
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Old 10-09-2006, 05:36 PM
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Sounds like the snout of the converter is binding as it slips into the crank, thus bending the flexplate.
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Old 10-09-2006, 06:30 PM
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Do I need another converter or could I use spacers at the bolt holes on the converter?
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Old 10-09-2006, 06:34 PM
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The snout needs to slide into the crank......take it off and see if it will slide in without the tranny. You should be able to see where it's binding. Probably a little grinding or file work will fix it up.
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Old 10-10-2006, 05:42 AM
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Shouldn't the convertor slide forward just a bit to "touch" the flexplate at the bolts?
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