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Old 02-26-2006, 08:06 PM
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Flexplate questions

Hey guys I have a 76 454 that was mated to a manual in a truck. I have since placed the motor in my Camaro and am trying to mate it to an automatic. What do I need to do to pull this off? I bought a "big block" flexplate but it didn't bolt up to my torque converter so I grabbed a "small block" flexplate and it is the same dia. and bolts right up and accepts my torque converter. Sooooo is there any weight/ balancing concerns here? Am I ok in doing this? Thanks for the help. If it matters the trans is a turbo 350.

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Old 02-26-2006, 08:11 PM
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Something doesn't sound right. When I did my 350 - 454 swap the engine was also out of a manual application. If memory serves I bought a flexplate for a 454. (I think from my local trans shop). I did not have any problems. I'm sure someone else will chime in.
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Old 02-26-2006, 09:59 PM
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You should need the weight corrected big block flexplate with the dual converter bolt pattern. (has 6 holes for the converter) Then it will bolt right up.
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Old 02-27-2006, 06:08 AM
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And if you have one that works and it doesn't have the 454 external balancing weight you will have major problems soon enough.

The external balancing weights are also sold seperately, I was just doing a search for something else and found some advertised for $15 somewhere on the net, these just bolt on between the crankshaft and flexplate, or the flexplate and converter, I can't remember which at the moment.
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Old 02-27-2006, 09:28 AM
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OK I got one, the right one, from SFI. It has the proper bolts locations for my torque converter and it weighted for the 454. Thanks for the guidance guys.
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Old 02-27-2006, 11:16 AM
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Glad you found success.

Mark
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Old 02-27-2006, 12:46 PM
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Quote:
Originally Posted by Jmark
Glad you found success.

Mark

I would'nt go that far, but I have the right flexplate.
Thanks again.
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Old 02-27-2006, 02:49 PM
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Glad you solved the problem.

For future reference, those plates that supposedly compensate for an internal-balanced flywheel to be used on an external-balanced engine are junk.
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Old 02-27-2006, 06:04 PM
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I have heard of them allowing the flexplate bolts to come loose, and also being installed backwards, but have never seen either.
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