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Can someone tell me what the difference is between jets with a D or C after their size? I've got one each of them in front of me, and I can't tell the difference.
NO!! C jets are 98% used on crossflow engine and D is for mainly loopers. It is the way jets are drilled as a C feeds from center of bowl to high speed orfice where a D flows from outside bowl toward center. You should never drill a jet as the swirls left in brass can effect fuel flow and actually cause it to run leaner. A jet if need to be modified should be reamed to size.so can you use a C jet if a D is specified?
so can you use a C jet if a D is specified?