427/454 Flywheel question
Thread Starter
Racer
Joined: Nov 2007
Posts: 320
Likes: 0
From: Upstate New York
427/454 Flywheel question
I am building a 68 427 and have a 168 tooth flywheel from a 454 that I would like to use but have heard that some of the 454's are externally balanced. If this is true how can I tell if it's going to be a problem?
Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
Yes,..454 flywheels (and balancers) are used to help balance the crank since there wasn't enough room in the crank-case for the 454 crank's counterweights,..hence, "externally balanced".
427's flywheels are neutrally balanced since a 427 crank is "internally balanced".
So the two aren't interchangeable.
427's flywheels are neutrally balanced since a 427 crank is "internally balanced".
So the two aren't interchangeable.
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
Yes,..454 flywheels (and balancers) are used to help balance the crank since there wasn't enough room in the crank-case for the 454 crank's counterweights,..hence, "externally balanced".
427's flywheels are neutrally balanced since a 427 crank is "internally balanced".
So the two aren't interchangeable.
427's flywheels are neutrally balanced since a 427 crank is "internally balanced".
So the two aren't interchangeable.
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
The 454 flywheel could be rebalanced to take the offset weight out of the flywheel. I took a 427 neutral balanced flywheel and had it offset balanced for the 454.
They could neutral balance that wheel.
They could neutral balance that wheel.
Thread Starter
Racer
Joined: Nov 2007
Posts: 320
Likes: 0
From: Upstate New York
Thank You 73, you really saved me some aggrivation!
I might be interested Ironcross, can you send pictures of the flywheel?
gregware7@aol.com
I might be interested Ironcross, can you send pictures of the flywheel?
gregware7@aol.com
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
http://forums.corvetteforum.com/show....php?t=1857077The casting date on this is H 24 7 August 24 1967. For a 68 Big Block
Last edited by 63mako; Nov 10, 2007 at 02:48 AM.
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Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Retail at local Advance Auto Parts chain store; brand is Perfection Clutch:
Both are flywheels & NOT flexplates; both for 2 piece rear main seal cranks w/ 3.58" bolt circle.
Both NEUTRAL flywheels fit either 350 sbc or 427 BBC.
Perfection P/N 506504 has 168T, weighs about 30 lbs & cost about $99.
Perfection P/N 506516 has 153T, weighs about 16 lbs & cost about $65.
If you can run the lighter 153T setup (starter, bellhousing etc) ... your motor will rev noticeably quicker. FYI ... 153T aka "L88" flywheel.
-edit- ENG40 should fill out profile to include an approximate geographic location. Advance auto parts store in same family as parts america, checkers, schucks & kragen.
Both are flywheels & NOT flexplates; both for 2 piece rear main seal cranks w/ 3.58" bolt circle.
Both NEUTRAL flywheels fit either 350 sbc or 427 BBC.
Perfection P/N 506504 has 168T, weighs about 30 lbs & cost about $99.
Perfection P/N 506516 has 153T, weighs about 16 lbs & cost about $65.
If you can run the lighter 153T setup (starter, bellhousing etc) ... your motor will rev noticeably quicker. FYI ... 153T aka "L88" flywheel.
-edit- ENG40 should fill out profile to include an approximate geographic location. Advance auto parts store in same family as parts america, checkers, schucks & kragen.
Last edited by jackson; Nov 11, 2007 at 02:18 AM.
