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I bought a 302 that had a balanced reciprocating assembly. I got a damper and flywheel with it. I now want to sell the flywheel, and a friend told me that the motor would have to be re-balanced to another flywheel if I did that. This doesn't really make sense to me. Since the motor is externally balanced, aren't the crank, rods, and pistons just balanced to each other? The damper and flywheel seem to be untouched.
Paleez Splain!

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Well Jim, yes the piston-rod-bearings are all balanced, but the balance job is done with the flywheel and Balancer. Each of these will have their own characteristics, and changing any one of the three will alter the balance accuracy. Most of us have a 'detroit' balance, or externally balanced engine. Som people have their engines nuetrally balance

Tom Kubler, Long-time Mustang Enthusiast & San Antonio Mustang Club Founder
 
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Its all a matter of tolerences. Internal or external balance makes no different. You could swap the flywheel out and be very close...probably. But the factory has pretty loose tolerences as consernes what is considered "balanced" AT a minimum, take both flywheels in and have the new on matched to the old one...that will save you from having to dissasemble the engine, and will probably be close enough.

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1970 Fastback, 4V 351C, various colors with black interior
 

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Discussion Starter #5
Jim Vogel
Tallmadge, Ohio

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My 5.0L is externally balanced, and requires a 50 oz. damper and roughly 22.5 oz. flywheel balance. That is because they use a lighter crankshaft, with less extra metal for balancing, and enables it to rev faster, and takes some of the load of the internal rotating assy.

If you put the wrong flywheel or damper on, you'll likely have some bad vibrations. So I've heard from two sources.

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