please help, balancer & flywheel question.
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Junior User
Joined: Aug 2003
Posts: 86
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From: Utah
please help, balancer & flywheel question.
i have a 81 bronc with a 79 302 in it can any of you please tell me how to tell if i have the correct harmonic ballancer and fly wheel on it i am in the process of reassembling the botton end, and when the truck had a small vibration all through the rpm range prior to dissassembly
New User
Joined: Jul 2003
Posts: 5
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please help, balancer & flywheel question.
I once replaced a 1981 255 in a LTD with a 1978 302 and reused the 255 flywheel & harmonic balancer. VERY noticeable vibration throughout rpm range. Also engine started knocking 4 years later. I think 1981 is the year the balance changed from internal to external or vice-versa.
Junior User
Joined: Jul 2003
Posts: 56
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please help, balancer & flywheel question.
it was the '80-'81 model years when the balance change on the 5.0L happened. They didn't go from external to internal though; the weight was increased from 28oz to 50oz. If your engine simply had the flywheel and balancer from the original engine put on it, it's no wonder it vibrates. Just as a note, the 351W has always had a 28oz balance factor.
Elder User
Joined: Oct 2002
Posts: 513
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From: Lincoln NE
please help, balancer & flywheel question.
'81 and earlier 302's had 28 oz. balance. From '82 and up, 302's were balanced with 50 oz.
351w's stayed balanced at 28 oz.
So you need a .28 oz balanced flywheel and harmonic balancer from a 351w or a pre '82 302.
351w's stayed balanced at 28 oz.
So you need a .28 oz balanced flywheel and harmonic balancer from a 351w or a pre '82 302.
