400 sb flywheel - Team Camaro Tech
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post #1 of 4 (permalink) Old Feb 18th, 10, 10:13 PM Thread Starter
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Location: olive branch , ms
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400 sb flywheel

Have a 400sb with external balance flywheel, with about 5 teeth that are chipped. Was wondering if I should replace flywheel or just try to work on starter clearance to prevent further chipping. I have been looking at other posts mentioning need to have the rotating assembly rebalanced if a new flywheel is used. Also tried removing flywheel by tapping with a rubber hammer and it wont come off.
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post #2 of 4 (permalink) Old Feb 19th, 10, 05:36 AM
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Re: 400 sb flywheel

If it is the original flexplate or an out of the box replacement you can simply swap on another one.Back in the day some rebuild shops that balanced cranks would drill the flexplate or damper when balancing an engine.This should only be done on internal balance engines when the flexplate is found to be a cause of unbalanace.Almost no shops drill flexplates any more and it is in fact against most racing rulebooks to modify the SFI approved flexplates,so that tells you how little reason there is to drill on a one.

As for removing your original,I agree that after a while they can get rusted onto the end of the crank.The only way to get them off is to whack it in one spot until you get a little space between the flexplate and crank flange then get a screwdriver in that space and work your way around opening the space up.Basically if you get a space at the bottom of the flange/flexplate seam you can bang a screwdriver up along both sides and get the seam moving.After you get a good seam,start shoving the plate back and forth to work it loose.You cant do this on a flexplate that you plan on reusing since even the initial banging usually bends the it.My opinion is that if you have the trans down do you really want to put it back up only to find that the problem cant be solved or comes back in a week or two?New stock replacement flexplates usually jobber between $25 and $30 at most parts stores and a brand new SFI one can be had for under $50 from most on line retailers.If you are like me and spilled 5 quarts or more of ATF all over the floor when you dropped the trans just the cost of dropping the trans again would double the cost of the job
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post #3 of 4 (permalink) Old Feb 19th, 10, 02:53 PM
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Re: 400 sb flywheel

Yes you can just replace in most cases...Yes they are a PITA to remove in the car...But I would solve the tooth chipping ASAP before you get stranded somewhere

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #4 of 4 (permalink) Old Feb 19th, 10, 05:49 PM
Join Date: Aug 1998
Location: Waldorf Md. USA
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Re: 400 sb flywheel

If it is a manual trans flywheel, the ring gear can easily be replaced. They are about $15. Knock the old gear off with a hammer and punch, then put the new gear in the oven at about 500 degrees for 15 minutes or so .... it will fall right on the flywheel and you can use the hammer and punch to get it all the way on if needed.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner

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