Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

flex plate interchange sm. chevy to big chevy ?

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Old 05-12-2005, 10:14 PM
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Question flex plate interchange sm. chevy to big chevy ?

will a 454 flexplate interchange with a 400sm.blk.
I noticed 3 additional drill notches on the 454 flexplate in addition to counterweight and did not see the drill nothes on the 400
Old 05-13-2005, 02:49 AM
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454 and a 350 are the same, but the 400 has a differnt crank that needs balancing. id get the 400 flexplate.
Old 05-13-2005, 05:55 AM
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Originally Posted by terr1bleone
454 and a 350 are the same, but the 400 has a differnt crank that needs balancing. id get the 400 flexplate.
the flexplate that I removed from my 454 is identical to the 400 even the counter weights are of the same size. I know that the 454 is also externally balanced but the 454 plate has three drill spots beside the counter weight
Old 05-13-2005, 12:42 PM
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well i dont really know then, i just know that they need different flywheels so i assume they need different flexplates



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