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Old November 8th, 2012, 09:44 AM
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455 flex plate...
Was wondering what most guys are using for a flex plate? Externally or internally balanced? Engine will produce 450/475 hp.

Thanks!
Steve...
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Old November 8th, 2012, 10:33 AM
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The 455 is externally balanced unless you changed it. That means an externally balanced flex plate. If internal balanced it would be neutral balanced and have no weights.
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Old November 8th, 2012, 11:37 AM
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For a street car in the 450/475hp range a regular old stock external balance flexplate is fine.
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Old November 8th, 2012, 08:07 PM
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I agree, I make way over 500HP when I use Nitrous, never had any problems with a stock flexplate or anything else for the last 25 years.

Oh, my engine is externally balanced.
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Old November 9th, 2012, 04:45 AM
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I have a new ATI flexplate,but have yet to use it.I have stock flexplates on my engines.
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