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motordr · 03-10-2020, 07:53 AM

Any early seventies GM Rochester 2-barrel diaphragm would work, will see if I can find the part number for you. Requires some cutting, bending and mig welding to keep heat from damaging the diaphragm.

03-10-2020, 07:53 AM	#15
motordr Senior Member Join Date: Nov 2010 Location: Beamsville,Ontario,Canada Posts: 482	Re: Speedo changer for Columbia 2 Speed Any early seventies GM Rochester 2-barrel diaphragm would work, will see if I can find the part number for you. Requires some cutting, bending and mig welding to keep heat from damaging the diaphragm.