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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Will same flywheel function on chevy 427 & 454 engines?
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Topic Review (Newest First)
12-16-2013 07:48 PM Tall deck or short doesn't make a difference. 366 396 402 427 all use neutral balance.
12-16-2013 07:32 PM
ProStreetRob Thats a good question and I honestly dont know the answer, only know the ones I've had or had problems with, the 350/400 screw up I experienced and I cracked a few 454 Flex Plates in my old 70 Chevelle SS

I do know those Tall Deck Truck & Bus Motors were pretty cool, I actually bought a big ***** GMC delivery truck @ 35 yrs ago and tried to fist put the BB in my Box Nova (screwed that up ). Then I put it in my 70 SS Camaro and it gave me many miles of tire shredding enjoyment.
12-16-2013 07:51 AM
RWENUTS Question for you Prostreet?
What about the 366 and 427 tall deck blocks. Same internally balanced like a 396 or 427 short deck or externally balanced.
12-16-2013 05:10 AM
ProStreetRob I made that mistake once and it wasnt pretty. I took out a normal internally Balanced 350 and installed what I thought was just a different year Junk Yard Motor. SOB turned out to be a 400 externally balanced motor and I used the original Flywheel and HOLY VIBRATION BATMAN IS ALL I CAN SAY
(what could I say it was 30+ years ago and I was young and foolish )


283-427 uses the same flex plate, (except 400)motors are Internally Balanced
454 uses a unique Flex Plate (except Gen V & VI) motor is Externally Balanced
12-16-2013 04:57 AM
painted jester
Originally Posted by View Post
It will bolt on but it won't work. 454 needs weighted flywheel/flexplate

12-15-2013 05:37 PM It will bolt on but it won't work. 454 needs weighted flywheel/flexplate
12-15-2013 05:21 PM
Will same flywheel function on chevy 427 & 454 engines?

I am running a 427 truck engine in my model a coupe with a 350 automatic.i am getting ready to put in a 454. My question is will the same flywheel work on both engines.

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