6 volt stomp starter has worked fine at 12 volts for over 40,000 miles in my '52 GMC. If you "upgrade" to a 12 volt starter you'll need to change the ring gear on the flywheel. Don't keep the 6 volt starter engaged for long on a 12 volt system.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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