I have 2 SBC powered rods both with the same illness. On moderate to heavy throttle acceleration they both make a ringing clatter sound. They both are running hi torque mini starters. It sounds very similar to a spark knock (severely loud) but maybe more metallic sounding. The little roadster has a Hamburg mini starter, the sedan has a chrome no-name mini starter. Is this a common ailment with these mini starters? I've shimmed them but without a lot of success. Maybe I should shim them more? A friend told me he has excellent luck with GM-Delco hi torque mini starters. Do you guys run into the noise problem too?