I have a 66 Coronet with a 318 poly. Anyone know where to get a replacement harmonic balancer? I'm having trouble finding one. If it interchanges with any other models, etc, that info would be helpful too. Thanks

Is it broke? If you cant find one, google harmonic balancer repair. Or something like that. I saw a few places that can replace the rubber ring if thats your issue.

I was reading about the poly and found a sight that a guy claimed to be putting the poly crank in his 340's because the poly "has a better crank" I haven't researched that but if the crank fits in a 340 I am wondering if the 340 balancer would fit. More research is needed .

AVANCE Auto pt. no. 3103 is the cover seal shown for the poly and the 69 340 . So thats the same or looks to be.