edgar86

Hello Everyone, I would first like to ask: what year did ford change its harmonic balancer weight? Was it in 81' from 28 oz to 50 oz on the 302? My problem is that I had an 80 model year 302 in my 66' mustang which was making a knocking sound, so I pulled it out and exchanged it for a short block. The block I was given ranged from 81-86 year models; I was told that the balancing was for 28 oz (or the light crankshaft, as they put it). So I bought a new 28 oz flexplate and harmonic balancer for the new block. As it turns out I cranked the engine today and it shakes like hell, especially from the rear of the engine and transmission. Was the balancing factor supposed to be for 50 oz instead of 28 or what else could be causing the vibrations?

Thank You
Edgar
P.S. "At least the knocking is gone"

Freshmeat

The "light" crankshaft would require 50oz imbalance, as they moved the weight from the crank to the balancer and flywheel.
It was in 1982 that they switched. Try a 50oz and see if they work. It'll reach the higher RPMs with less effort, from what I hear.

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edgar86

Hey, I want to thank you for the info. Freshmeat. Of all the places I read and called no-one was able to give me an answer like you did. I went to the salvage yard today and picked up a 50 oz balancer and flexplate, the engine is running nice and smoothly... as it should

Freshmeat

That's fantastic to hear. Now- where are your pictures?

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