FELT DONUT BEHIND THE STEEL CRANK BALANCER

RustyRatRod said

I've pulled them off 340s and later 360s, so they were used well past 68. My 77 360 had one on it.

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I've seen many on later engines too........ones that had been apart before.....not on virgin engines. If you look in the '68 factory parts manual, that felt is no longer shown, and a new part number seal is used.