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Old 09-21-2011, 05:52 PM
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305 Vortec Harmonic balancer

Will a Harmonic balancer from a 305 vortec engine work on a 350 carburated engine? The flexplate from the vortec has a weight on it and the 350 flexplate doesn't. Any ideas?

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Old 09-21-2011, 06:04 PM
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A weight on the harmonic damper or the flexplate or the flywheel will indicate that the motor is externally balanced and therefore all weighted parts must be replaced with exact-same weighted parts. All non-weighted dampers, flexplates, flywheels must be replaced with the exact-same non-weighted parts. The motor with these non-weighted parts has been internally balanced by drilling the counterweights of the crank or adding Mallory Metal (a metal alloy with a density exceeding that of cast iron and steel) into holes drilled horizontally through the crank counterweights.
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Old 09-21-2011, 07:41 PM
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Originally Posted by Lugnut38030
Will a Harmonic balancer from a 305 vortec engine work on a 350 carburated engine?
Yes, it will physically fit the engine and it is also neutral balanced like the carbed 350 engine- but some of the Vortec engines use a reluctor wheel behind the damper (seen on the left, below).

The Vortec damper from a reluctor wheel-equipped engine is shorter by the thickness of the reluctor, so if the Vortec reluctor damper is used on a non-reluctor wheel application, the damper could go on too far and the pulleys might not line up, and the damper might even bottom out on the timing cover. The crankshaft gear also won't be "sandwiched" between the crank and the damper snout. You could make a spacer by cutting down a reluctor and things might work out OK- although I've not tried this yet.

Some Vortec engines don't use the reluctor wheel. On those engines, I do not know if the damper is longer or if there's a spacer used. If you have access to the 305 engine, look to see what it uses and compare the lengths of the damper snouts.

The flexplate from the vortec has a weight on it and the 350 flexplate doesn't. Any ideas?
Yeah- don't try to use the counterweighted flexplate on the 350! Not that you could anyway- the bolt pattern is different between 1- and 2-piece rear main seal cranks.
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