I have used a burr quite successfully when I have done this. You can also
try a wheel but it must be very coarse to stop the loading that you refer
to. For final finishing, I wrapped a bunch of steel wool around a mandrel
and used it to polish the ports.
Mike
>
> But now I want to do a bit of port matching between the intakes and
> the carbs. What is the proper way to grind aluminum? It always
> seems to load up the stone/paper/whatever.
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