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The outer spring should have same OD as a single spring as they fit the same pocket. So no, you should not have to clearance the rocker. Thousands of dual spring kits are in use with stock rockers.
okay, I just came across this while looking around LS1HowTo and i was wondering
Most dual spring kits on the market are 1.3xx” diameter. The 1.43” diameter spring the picture said it was clearanced for will not usually fit a stock spring pocket.