How can I tell if my BBC is internal/external balanced??... - Team Camaro Tech
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post #1 of 7 (permalink) Old Dec 27th, 05, 05:53 PM Thread Starter
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How can I tell if my BBC is internal/external balanced??...

Is there a way to tell?.. Or do I have to drop the pan??.. Thanks for any help or advice!...
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post #2 of 7 (permalink) Old Dec 27th, 05, 06:29 PM
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Re: How can I tell if my BBC is internal/external balanced??...

Easiest way is to look at the balancer. External balance balancer would have part of the outer circumference machined away - enough to notice. (GM balancer) I believe some aftermarket balancers would have a weight added.

You could also check the flywheel. Ext balance would have a weight on the back side of it.

Not positve on this, but pretty sure that 396/427 were internal balance from GM. 454 was external balance.

No need to drop the pan.


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post #3 of 7 (permalink) Old Dec 27th, 05, 06:44 PM
 
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Smile Re: How can I tell if my BBC is internal/external balanced??...

Nope, BPOS is thinking of the 400 SB balancer.

You need to crawl down under the very front and then stick your hand up inside the back of the balancer on a stock BB and "feel" for the "dog-knot" up in there that create's the external balance for the 454/502 motors.

The other BB motors will be smooth and round back in there all the way around!

And, yes, I have done this in the field!!

BPOS is right about the flywheel/flexplates, but I still don't know how to tell an externally balanced 400 SB and 454/502 BB flywheel or flexplate apart at a glance from say 5 feet??

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post #4 of 7 (permalink) Old Dec 27th, 05, 06:48 PM
 
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Re: How can I tell if my BBC is internal/external balanced??...

You Will See A Weight Welded On Just Under The Teeth.......its About41/2 Long And 1'' Wide
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post #5 of 7 (permalink) Old Dec 28th, 05, 04:14 AM Thread Starter
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Re: How can I tell if my BBC is internal/external balanced??...

Thanks you guys!.. I will check it out!!... This engine is freshly painted on the stand, I am getting ready to buy the flywheel clutch set up for it... May the best of the year behind us, be the worst of the year ahead!!!.. Happy New Year!..

Last edited by PLT-1; Dec 28th, 05 at 04:58 AM.
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post #6 of 7 (permalink) Old Dec 29th, 05, 10:35 PM
 
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Re: How can I tell if my BBC is internal/external balanced??...

454 is ext. balanced the only one.
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post #7 of 7 (permalink) Old Dec 30th, 05, 06:33 AM
 
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Smile Re: How can I tell if my BBC is internal/external balanced??...

Stock motors; 400 SB, then the 454 and 502 BB's if not mistaken.

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