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The German tuner that is going to balance my rotating assembly told me the same:if you're going to machine your own pulley(which I did)then make a steel one-the ass'y runs far smoother on the balancer.
For upright there are only aluminum ones that CSP sells that I know of.
Regards,Arnoud
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pre-'55 oval:stuffed in a barn
1972 1302S(Cali Type4 EFI)
1973 1303S(soon with Oettinger TSV2000)
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