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post #1 of 4 (permalink) Old 10-25-07, 10:17 AM Thread Starter
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Balancing

I have a 1970 Thunderjet 429, had it rebuilt and now running it in my 79 Bronco. Problem is, I want to upgrade this engine to a serpentine belt system, but my crank pulley is 3 bolt.

So my question, is it possible to take a neutral balanced 429-460 damper, and install it, then just bolt on the 4 bolt pulley?
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post #2 of 4 (permalink) Old 10-25-07, 01:23 PM
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cool Re: Balancing

Quote:
Originally Posted by 78Jimmy
I have a 1970 Thunderjet 429, had it rebuilt and now running it in my 79 Bronco. Problem is, I want to upgrade this engine to a serpentine belt system, but my crank pulley is 3 bolt.

So my question, is it possible to take a neutral balanced 429-460 damper, and install it, then just bolt on the 4 bolt pulley?
All 460 dampers are zero balanced.

Paul


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Performance Components for the 429/460 Engine Family
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post #3 of 4 (permalink) Old 10-25-07, 02:12 PM Thread Starter
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Re: Balancing

Good to know, I wasn't sure if the balancing all took place in the flywheel or both flywheel and damper.

What years where 460's balanced internally vs externally?
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post #4 of 4 (permalink) Old 10-26-07, 06:04 PM
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cool Re: Balancing

Quote:
Originally Posted by 78Jimmy
What years where 460's balanced internally vs externally?
1978 & earlier are internal balance, while 1979 & up are external balance.

The balncing is done at the flexplate and the spacer/sleeve between the balancer and the timing cover; the external balance flex plate has a weight welded to it while the external balance spacer has a "hatchet weight" swinging from it. The internal balance engines have niether weights.

The internal balance crankshaft will not readily drop into an external balance (D9TE-AB casting) cylinder block.

Paul


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